Faculative
a. 允许的, 任意的, 兼性的, 偶发的
🗣️ 情景例句
She has a high reputation as a writer.
她是个有名气的作家。
Yes,he does.
是的，他有。
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。