The teacher should not move around too much as this makes lip reading more difficult.

老师不应该频繁走动，因为这会加大唇读的难度。

柯林斯例句

Some deaf and mute people have strong lip - reading ability.

有的聋哑人练就了很强的唇读能力.

互联网

To interpret ( utterances ) by lip reading.

唇读通过观察口形来理解 ( 话 )

互联网