Nabla
纳布拉琴, 劈形算符(数学符号), 微分算符[子]
🗣️ 情景例句
Don't feed the bears.
不要给熊喂食。
They are looking forward to the summer vacation.
他们正盼望着暑假的来临。
At the same time our sympathy for Galileo's opponents has grown somewhat.
与此同时，我们对伽利略的反对派的同情也有所增加。