學生不開攝像頭的話，教師難以掌握學生是否認真聽講以及聼明白所講内容。

學生不開攝像頭的話，教師難以掌握學生是否認真聽講以及聼明白所講内容。

結果 (英文) 1:

If the students do not turn on the camera, it is difficult for teachers to grasp whether the students are listening carefully and understand what is being said.

結果 (英文) 2:

If the students don't turn on the camera, the teacher will have difficulty mastering whether the students listen carefully and understand what they are saying.

結果 (英文) 3:

If the students don't turn on the camera, it is difficult for teachers to grasp whether the students listen carefully and understand what they are saying.