Bivariants
双变式
🗣️ 情景例句
I'm sick of English, I want to learn French.
我讨厌英语，我想学法语。
Time will tell.
时间会证明的。
the varieties are infinite; but two classes may be roughly seen.
鸟的飞行方式千差万别，但大体上可分为两类。