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