diverse students participating actively during brain anatomy class with a cheerful black male teacher - 舉手 個影片檔及 b 捲影像00:10學生
man standing on beautiful seascape, young man enjoying view from mountain top, man watching view from high and feeling free, freedom stance in nature - 舉手 個影片檔及 b 捲影像00:07
ms pan diverse group of students in lecture hall / richmond, virginia, united states - 舉手 個影片檔及 b 捲影像00:19
rear view of student raising hand and asking teacher for questions during class - 舉手 個影片檔及 b 捲影像00:16
close up facial expression and positive emotion asian young adult feeling relax and touching sunbeam under the tree - 舉手 個影片檔及 b 捲影像00:10
ms pan teacher teaching maths in classroom with flash cards / richmond, virginia, united states - 舉手 個影片檔及 b 捲影像00:42
closeup diverse finance team business meeting listening presentation investment strategy and budget plan at office. marketing strategy analysis, stock market trading, financial consultant concept. - 舉手 個影片檔及 b 捲影像00:17
businesswoman raising her hand to ask a question at a seminar in a board room - 舉手 個影片檔及 b 捲影像00:22會展中心
businesswoman speaking at a conference with an engaged audience raising hands - 舉手 個影片檔及 b 捲影像00:08學生
asian senior adult businessman getting questions during business speech conference in business meeting room in office - 舉手 個影片檔及 b 捲影像00:19
african woman raising her hand to ask a question during an adult education session - 舉手 個影片檔及 b 捲影像00:13學生
children raising hands in classroom as teacher lectures / michigan / medical industrial - 舉手 個影片檔及 b 捲影像00:05
education, children or student with answer in classroom or library for learning development. hands up, girl or kids listening to a teacher and asking for feedback, information or knowledge at school - 舉手 個影片檔及 b 捲影像00:08學生
male doctor explaining new concepts during class and young student asking a question - 舉手 個影片檔及 b 捲影像00:12
group of volunteers raise their hands together in unity during community event - 舉手 個影片檔及 b 捲影像00:05歡呼, 美國
demonstrators hold signs chanting "don't shoot" "hands up" and raise their arms up in a gesture while others hold up signs in front of st. john's... - 舉手 個影片檔及 b 捲影像00:36
ms businessman leading contentious meeting with four executives / portland, oregon, usa - 舉手 個影片檔及 b 捲影像00:37
ms td baby girl (6-11 months) in playpen reaching for camera / miami, florida, usa - 舉手 個影片檔及 b 捲影像00:05
khrushchev in france, the paris summit : khrushchev press conference in building next to champs de mars, may 18, 1960. speaks about germany, usa,... - 舉手 個影片檔及 b 捲影像00:35
