Afr
[计] 容许故障率
🗣️ 情景例句
Just make the few changes I suggested and your letter will be perfect!
只要改动我提到的个别地方，你的信就会很完美了。
It is good to have friends in trouble.
在患难时得到朋友是幸运的。
I repeated my question several times and at last he understood.
我把问话重复了很多遍。他终于听懂了。