https://online2.tingclass.net/lesson/shi0529/0008/8532/p122.mp3
https://image.tingclass.net/statics/js/2012
The rain has let up, so we can play outside .
雨停了,我们可到外边玩了。
let someone down 是指让某人失望,相当于 disappoint someone。但并没有 let someone up 这个用法,let up是指持续久的事停止下来,如大雨`大火等。
The big fire finally let up.
大火终于停了。