Back mutation
回复突变
🧩 词语组成解析
back
[bæk]
n. 背，背部;背面，反面;后面，后部;（椅子等的）靠背;
vt. 使后退;支持;加背书于;下赌注于;
vi. 后退;倒退;
adj. 背部的;后面的;以前的;拖欠的;
adv. 以前;向后地;
🗣️ 情景例句
It isn't the way I hoped it would be.
这不是我所盼望的。
No man (or one) is wise at all times.
聪明一世糊涂一时。
It's very smart.Short skirts are in fashion now.
它很时髦。短裙现在很流行。