the woman holds a tuning fork to her ear - she listens to it and sings its door. - 音叉 個影片檔及 b 捲影像00:16
the woman holds a tuning fork to her ear - she listens to it and sings its door. - 音叉 個影片檔及 b 捲影像00:12
the woman holds a tuning fork to her ear - she listens to it and sings its door. - 音叉 個影片檔及 b 捲影像00:14
wondering about sound (2nd edition)- part 7 of 16. introduce children to the wonders of sound through the original music and lyrics of a rock'n'roll band. with the help of colorful visuals, the band explains vibration and sound waves, inviting viewers to - 音叉 個影片檔及 b 捲影像00:30
tanzania, lake eyasi, hadzabe tribe, young man tuning traditional musical instrument - 音叉 個影片檔及 b 捲影像00:21
elementary age boy of indian ethnicity on bicycle playing musical instrument harmonica outdoor in nature - 音叉 個影片檔及 b 捲影像00:34
auto technician mechanic adjusting wheel balancing at the garage. vehicle maintenance auto service workshop. - 音叉 個影片檔及 b 捲影像00:05
auto technician mechanic adjusting wheel balancing at the garage. vehicle maintenance auto service workshop. - 音叉 個影片檔及 b 捲影像00:06
auto technician mechanic adjusting wheel balancing at the garage. vehicle maintenance auto service workshop. - 音叉 個影片檔及 b 捲影像00:08
auto technician mechanic adjusting wheel balancing at the garage. vehicle maintenance auto service workshop. - 音叉 個影片檔及 b 捲影像00:10體檢
auto technician mechanic adjusting wheel balancing at the garage. vehicle maintenance auto service workshop. - 音叉 個影片檔及 b 捲影像00:09
auto technician mechanic adjusting wheel balancing at the garage. vehicle maintenance auto service workshop. - 音叉 個影片檔及 b 捲影像00:08
a detailed closeup image of a dirty air filter located on a car engine, useful for maintenance inspection - 音叉 個影片檔及 b 捲影像00:11
the woman holds a tuning fork to her ear - she listens to it and sings its door. - 音叉 個影片檔及 b 捲影像00:14
the woman holds a tuning fork to her ear - she listens to it and sings its door. - 音叉 個影片檔及 b 捲影像00:14
story of how one boy becomes aware of the world of sound which exists all about him. experiments with a tuning fork show that sounds are caused by... - 音叉 個影片檔及 b 捲影像00:34美國
story of how one boy becomes aware of the world of sound which exists all about him. experiments with a tuning fork show that sounds are caused by... - 音叉 個影片檔及 b 捲影像00:28
story of how one boy becomes aware of the world of sound which exists all about him. experiments with a tuning fork show that sounds are caused by... - 音叉 個影片檔及 b 捲影像00:34
vibrations - part 3 of 23. to show that a vibration occurs whenever an action is repeated with regular rhythm, we see a tuning fork vibrate. vibrating arms of the fork strike against surrounding air particles which strike against our ears and produce soun - 音叉 個影片檔及 b 捲影像00:35