medium shot rear view of girl figuring out math problem on chalkboard / turning around and looking satisfied - 黑板 個影片檔及 b 捲影像00:22
sun in orange sky, sunset, trees, branches & leaves in silhouette, male scientist writing equation underneath 'sub-solar surface', 'convection',... - 黑板 個影片檔及 b 捲影像00:14日落, 數學符號
b/w 1940s/50s man lecturing at chalkboard / pan to audience of businessmen + men in white uniforms - 黑板 個影片檔及 b 捲影像00:18
shot of empty classroom with chairs under desks in elementary school. school during vacation or holidays, a teaching classroom without students during a term break or the end of semester in kindergart - 黑板 個影片檔及 b 捲影像00:10綠色
ms young woman standing after writing mathematical formula on blackboard / singapore - 黑板 個影片檔及 b 捲影像00:06
zoom in female teacher writing arithmetic problems on chalkboard in classroom as children raise hands - 黑板 個影片檔及 b 捲影像00:06
stop-motion animation of a white chalk border hand-drawn on a black chalkboard. - 黑板 個影片檔及 b 捲影像00:10
green mock up blank vertical billboard on the city street for advertisement in chicago, illinois, usa - 黑板 個影片檔及 b 捲影像00:21廣告, 美國
presents interviews with four scientists who explore their thought processes, personalities, and methods of work as they analyze ways by which they... - 黑板 個影片檔及 b 捲影像00:35數學符號
boy writing math equations in a class lesson. school kid solving maths problem on a whiteboard in a classroom. young confident student writing on a board during tutoring to practice mathematics - 黑板 個影片檔及 b 捲影像00:06數學符號, 學生
ms young woman writing mathematical formula on blackboard in classroom / singapore - 黑板 個影片檔及 b 捲影像00:05數學符號, 印度人
1939 ms teacher standing before class, students raising their hands, one student standing and walking to blackboard, where other students are working / usa - 黑板 個影片檔及 b 捲影像00:15學生, 少女
a man wearing a shirt who is trying to draw a graph on an old-fashioned blackboard placed in a warehouse studio rubs out a mistake in chalk with an eraser, only to drop the chalk moments later, uk. - 黑板 個影片檔及 b 捲影像00:14
shot notre dame fighting irish football coach frank leahy stands with team captain paul lillis on football field / montage team watches as leahy... - 黑板 個影片檔及 b 捲影像00:30美式足球 - 團體運動
stop-motion animation of a spiral-bound blank, grid pattern, white paper notebook on a grunge-style weathered black chalkboard background. - 黑板 個影片檔及 b 捲影像00:10
the company's global business analysis plan is explained by a group of young, multiethnic business team members who are brainstorming in a modern office while using high-tech transparent board shows and futuristic holograms.the esg meeting. - 黑板 個影片檔及 b 捲影像00:06
the company's global business analysis plan is explained by a group of young, multiethnic business team members who are brainstorming in a modern office while using high-tech transparent board shows and futuristic holograms.the esg meeting. - 黑板 個影片檔及 b 捲影像00:11辦公室
hands, woman and writing formula on glass, problem solving and science in laboratory for innovation. medical, drug development and wall for chemical solution, molecule equation and research analysis - 黑板 個影片檔及 b 捲影像00:08
ms zi shot of girl writing something on blackboard / grossweil, bavaria, germany - 黑板 個影片檔及 b 捲影像00:10
diverse team working at a cafe preparing everything to open for service and manager giving instructions to a male employee - 黑板 個影片檔及 b 捲影像00:15茶餐廳
hindu family - part 2 of 19. describes the celebration of the marriage of the daughter of a brahmin and the customs of old and new india as they are reflected in the daily life of a hindu family. setting: the village of atgaum in the province of gujerat - 黑板 個影片檔及 b 捲影像00:36女人
