Nabla
纳布拉琴, 劈形算符(数学符号), 微分算符[子]
🗣️ 情景例句
Food is necessary to maintain life.
食物是维持生命所必须的。
These drawings on the wall are process sheets.
墙上的图表是工艺流程表。
Personally, I'd rather go to the Science Museum.
就我个人而言，我倒想去科技馆。