Faculative
a. 允许的, 任意的, 兼性的, 偶发的
🗣️ 情景例句
You asked to see me.
你要求见我。
I'd like to know how you reached your conclusions.
我想知道你们是如何得出结论的。
They don't get enough air.
（那样）鱼得不到充足的空气。