Bidirection
雙向
??? 情景例句
She is giving me piano lessons in exchange for her English classes.
我教她英語，她教我彈鋼琴。
I'm the youngest boy in my team.
我是我的那一隊伍中最年輕的男孩。
We'll have to get this contract typed as soon as possible.
我們得盡快把契約書打出來。