Nabla
纳布拉琴, 劈形算符(数学符号), 微分算符[子]
🗣️ 情景例句
Retired and moved to New York
我退休了， 搬到纽约
A good book is a best friend who never turns his back upon us.
一本好书，莫逆之交。
Certainly!
当然可以！