Subdifferential
次微分
🗣️ 情景例句
I never could tie one of those ...
我从来就不会打那一类的……
A person must strain one's ears to hear a wild animal in the forest.
在森林里，人类必须对野兽竖起耳朵才行。
I'm afraid I haven't got a larger dress.
恐怕没有更大的了。