Nondifferentiable
不可微分的
🗣️ 情景例句
Who is that?
你是谁？
The small courtesies sweeten life; the greater ennoble it.
有点礼貌使生活愉快，多点礼貌使生活高尚。
It's my birthday, and I'm going to have a party. Didn't you know?
我的生日聚会，我计划举办一个聚会。你不知道吗？