Backcross
vt.vi. 使回交, (使)逆代杂交
✅ 同义词
🗣️ 情景例句
I hear the exams will be very tough.
我听说考试挺难的。
You can go whenever you wish.
无论何时你希望去你就能去。
' I looked down and nearly fell off the ladder when I saw a policeman.
”我向下面看去。当我看清是一个警察时，差一点儿从梯子上掉下去。