college tutor teaching design class, showing them how to use pair of compasses - 繪圖圓規 個影片檔及 b 捲影像00:06
college design technology lecturer demonstrating how to use a pair of compasses - 繪圖圓規 個影片檔及 b 捲影像00:12
sequence showing a man demonstrating the detection of wildfires from a watchtower. shows a low-angle shot of a tall watchtower and shots of the man... - 繪圖圓規 個影片檔及 b 捲影像00:16
maps, cellphone and woman exploring in nature while on a vacation, adventure or weekend trip. travel, explore and female with a online gps on her phone while walking in a field or garden on holiday. - 繪圖圓規 個影片檔及 b 捲影像00:14
magnetic, electric and gravitational fields - part 5 of 19. evidence of the magnetic field is illustrated by bringing a compass close to a magnet and watching the compass needle. further evidence of an electric field is demonstrated by rubbing a plastic r - 繪圖圓規 個影片檔及 b 捲影像00:32
magnetic, electric and gravitational fields - part 4 of 19. evidence of the magnetic field is illustrated by bringing a compass close to a magnet and watching the compass needle. further evidence of an electric field is demonstrated by rubbing a plastic r - 繪圖圓規 個影片檔及 b 捲影像00:35
vertical education concept with back to school text on black board in 4k resolution - 繪圖圓規 個影片檔及 b 捲影像00:05