Nabla
纳布拉琴, 劈形算符(数学符号), 微分算符[子]
🗣️ 情景例句
It's only natural that if I care about Michelle
假如我关心 Michelle
I hope so.
我希望如此。
the other the lack of freedom of the individual research worker.
二是研究人员缺乏个人自由。