可引用的發言段落Citable transcript turn
#9640
講者：Speaker:
Is it difficult to keep people engaged over courses around three or four weeks?
鍵盤快捷鍵Keyboard shortcuts
j 下一段next turnk 上一段previous turn
可引用的發言段落Citable transcript turn
講者：Speaker:
Is it difficult to keep people engaged over courses around three or four weeks?
j 下一段next turnk 上一段previous turn