Nabla
納布拉琴, 劈形算符(數學符號), 微分算符[子]
??? 情景例句
I'd like to have you meet my foreman--
我希望帶你去認識工頭，
We must arrive there on time.
我們必須準時到那兒。
I'm going to give her a book.
我想送她一本書。