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教学图像

Boy trying to solve the equation on the blackboard

Boy trying to solve the equation on the blackboardFREE

Office worker teaching coworkers

Office worker teaching coworkersFREE

Two businesswomen working together in the office

Two businesswomen working together in the officeFREE

Portrait of smiling male teacher in front of chalkboard writing

Portrait of smiling male teacher in front of chalkboard writingFREE

Businessman giving presentation 免版税图像

Businessman giving presentationFREE

Grandmother and grandchildren using digital tablet 免版税图像

Grandmother and grandchildren using digital tabletFREE

Businesswomen working on the project 免版税图像

Businesswomen working on the projectFREE

College students looking at the camera

College students looking at the cameraFREE

Schoolgirls looking at a globe in the classroom

Schoolgirls looking at a globe in the classroomFREE

College students studying a model of molecular structure

College students studying a model of molecular structureFREE

Business people having meeting

Business people having meetingFREE

Young woman trying to cheat during examination

Young woman trying to cheat during examinationFREE

Students looking at plant with a magnifying glass 免版税图像

Students looking at plant with a magnifying glassFREE

Students in training class male student raising hand

Students in training class male student raising handFREE

Office worker writing on whiteboard 免版税图像

Office worker writing on whiteboardFREE

Businesswomen working in creative office

Businesswomen working in creative officeFREE

Businessman taking down some notes while listening to a presentation 免版税图像

Businessman taking down some notes while listening to a presentationFREE

Woman writing hello in chinese

Woman writing hello in chineseFREE

Woman and man having discussion with another man in the background 免版税图像

Woman and man having discussion with another man in the backgroundFREE

Business people working in creative office 免版税图像

Business people working in creative officeFREE

Grandmother and grandchildren using digital tablet

Grandmother and grandchildren using digital tabletFREE

Students and teacher examining potted plants through magnifying glass 免版税图像

Students and teacher examining potted plants through magnifying glassFREE

Students having group discussion

Students having group discussionFREE

Senior woman and children spending time together 免版税图像

Senior woman and children spending time togetherFREE

Corporate people busy writing

Corporate people busy writingFREE

Schoolboy holding a little turtle in his hands beijing

Schoolboy holding a little turtle in his hands beijingFREE

Senior man and children spending time together 免版税图像

Senior man and children spending time togetherFREE

Man and women falling asleep after listening to a dull presentation by the manager

Man and women falling asleep after listening to a dull presentation by the managerFREE

Row of students standing in line in school cafeteria

Row of students standing in line in school cafeteriaFREE

Schoolchildren and teacher playing with pet rabbit in the classroom

Schoolchildren and teacher playing with pet rabbit in the classroomFREE

Businesswomen working on the project 免版税图像

Businesswomen working on the projectFREE

Young woman daydreaming in the library

Young woman daydreaming in the libraryFREE

A man teaching while the others sleeping 免版税图像

A man teaching while the others sleepingFREE

Father and daughter playing the piano

Father and daughter playing the pianoFREE

College students raising hands in the classroom

College students raising hands in the classroomFREE

Businessman and businesswoman working outdoors

Businessman and businesswoman working outdoorsFREE

Young man sleeping in the class 免版税图像

Young man sleeping in the classFREE

Lunch break in the office

Lunch break in the officeFREE

Mather and daughter watching a movie in the subway

Mather and daughter watching a movie in the subwayFREE

Female student writing on blackboard 免版税图像

Female student writing on blackboardFREE

Young woman whispering to her friend 免版税图像

Young woman whispering to her friendFREE

Father and son arm wrestling

Father and son arm wrestlingFREE

Bored businesswoman in a meeting

Bored businesswoman in a meetingFREE

Girl standing in front of blackboard holding a chalk

Girl standing in front of blackboard holding a chalkFREE

Schoolgirls examining turtle through magnifying glass in the classroom 免版税图像

Schoolgirls examining turtle through magnifying glass in the classroomFREE

Father and son in school classrrom

Father and son in school classrromFREE

Close up of arms and hands of business people in the office having a business meeting 免版税图像

Close up of arms and hands of business people in the office having a business meetingFREE

Old professor scolding his students for talking in the class 免版税图像

Old professor scolding his students for talking in the classFREE

Business people working in creative office

Business people working in creative officeFREE

Businessman using binoculars 免版税图像

Businessman using binocularsFREE

Businesspeople working together

Businesspeople working togetherFREE

Business people having meeting in board room

Business people having meeting in board roomFREE

Female student with her hand raised 免版税图像

Female student with her hand raisedFREE

Young man scratching head while young woman laughing with confidence

Young man scratching head while young woman laughing with confidenceFREE

Office worker teaching coworkers

Office worker teaching coworkersFREE

Couple looking up

Couple looking upFREE

Female student smiling at the camera course mates paying attention 免版税图像

Female student smiling at the camera course mates paying attentionFREE

Camera iconFREE

Colleagues 免版税图像

ColleaguesFREE

Teachers talking at lunch in school cafeteria 免版税图像

Teachers talking at lunch in school cafeteriaFREE

Businessman standing with stuck of papers in the office portrait

Businessman standing with stuck of papers in the office portraitFREE

Girl standing in front of the blackboard

Girl standing in front of the blackboardFREE

Five friends sitting in coffee shop reading 免版税图像

Five friends sitting in coffee shop readingFREE

Old professor explaining new formula to his students 免版税图像

Old professor explaining new formula to his studentsFREE

Team of people working on the project 免版税图像

Team of people working on the projectFREE

Businesspeople working together

Businesspeople working togetherFREE

Business woman looking through binoculars

Business woman looking through binocularsFREE

Office meeting with coworkers

Office meeting with coworkersFREE

Young couple looking out with binoculars 免版税图像

Young couple looking out with binocularsFREE

Girl smiling and holding bunch of notebooks and digital tablet studio

Girl smiling and holding bunch of notebooks and digital tablet studioFREE

School boy holding food tray in school cafeteria 免版税图像

School boy holding food tray in school cafeteriaFREE

Mother and children playing chess game in the park

Mother and children playing chess game in the parkFREE

Three women with fans and tablet outdoors

Three women with fans and tablet outdoorsFREE

Young woman copying her course mateã¢â‚¬â„¢s work 免版税图像

Young woman copying her course mateã¢â‚¬â„¢s workFREE

Boy standing with his arms folded the rest watching

Boy standing with his arms folded the rest watchingFREE

Women working together at the park

Women working together at the parkFREE

Two business people discussing and gesturing over the table while another looks out the window hands only

Two business people discussing and gesturing over the table while another looks out the window hands onlyFREE

Close up of businessman using binoculars reflection 免版税图像

Close up of businessman using binoculars reflectionFREE

Young man sleeping in the class

Young man sleeping in the classFREE

Businessman giving presentation to colleagues in board room

Businessman giving presentation to colleagues in board roomFREE

Businessman and businesswoman working outdoors 免版税图像

Businessman and businesswoman working outdoorsFREE

Young business people checking their cell phones

Young business people checking their cell phonesFREE

College students paying attention in the class 免版税图像

College students paying attention in the classFREE

Parent and child that the internet

Parent and child that the internetFREE

Family sitting in the subway

Family sitting in the subwayFREE

Businesswoman looking over her shoulder at the camera 免版税图像

Businesswoman looking over her shoulder at the cameraFREE

Three men looking at laptop

Three men looking at laptopFREE

Senior man looking through binoculars

Senior man looking through binocularsFREE

Boy and girl reading together

Boy and girl reading togetherFREE

Man doing accounts in cafe

Man doing accounts in cafeFREE

College students chatting in the class

College students chatting in the classFREE

Female student smiling at the camera course mates paying attention

Female student smiling at the camera course mates paying attentionFREE

Business meeting 免版税图像

Business meetingFREE

Business people having meeting in the office

Business people having meeting in the officeFREE

College students each other to show the mobile phone

College students each other to show the mobile phoneFREE

An african american man doing a performance in the meeting room

An african american man doing a performance in the meeting roomFREE

Five students sat reading outdoors 免版税图像

Five students sat reading outdoorsFREE

Two girls studying together 免版税图像

Two girls studying togetherFREE

Two girls watching their father surfing the internet

Two girls watching their father surfing the internetFREE

Businesswoman by whiteboard

Businesswoman by whiteboardFREE