Derivativeness
可微商性, 可微商情况
🗣️ 情景例句
A thief has just robbed me. Can you send the police?
一个盗贼抢劫了我，你能替我报警吗？
How much is it by air mail?
航空信要多少钱？
Pairs in the spring, eh?
那是巴黎之春，是吗？