Retractability
n. 收缩核
🗣️ 情景例句
Sure, I can.
当然， 我可以。
I know the boy whose father is a banker.
我知道那个男孩的父亲是银行家。
It seems she was in class on Friday afternoon, but no one has seen her since.
好象她星期五还在教室，但从那以后没人看见过她。