補充04/12第3節課請到DropBox同一個檔案有3種格式(mp4, avi, mpeg):

https://www.dropbox.com/scl/fo/thjxvfu6r660rw1h4bnex/AHG9KI8k-VFB61BoEHALEfw?rlkey=vfut6v29rhsqix8jh0c291734&dl=0