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
A lot of people would like my help.
许多人要我帮助。
I don't like the rush of the city.
我不喜欢纷繁忙碌的城市生活。
I apologize for being so angry with you.
我为跟你发火向你道歉。