Nabla
纳布拉琴, 劈形算符(数学符号), 微分算符[子]
🗣️ 情景例句
Shells she sells on the seashore are seashells I am sure.
我敢肯定她在海边卖的贝壳是海贝。
A man of words and not of deeds is like a garden full of weeds.
讲而不做，犹如花园里长满了荒草。
Have you had a wash yet?
你洗过脸了吗？