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
What time will the plane land?
飞机在什么时间降落？
I guess he will say something.
我猜他会说什么。
When he asked if Mr.Lane lived there, the policeman on duty told him that since his defeat, the ex-Prime Minister had gone abroad.
当他询问莱恩先生是否住在那里时，值班的警察告诉他这位前首相落选后出国去了。