Obligative
专性的
🗣️ 情景例句
I go to brunch every Sunday.
我每星期天早午餐合吃。
Do you have a ball point pen?
你有圆珠笔吗？
Some children can cover the whole length of the pool without coming up for breath even once.
有些孩子能够跑完游泳池的全长而不用露出水面换气。