Derivator
[计] 微分器
🗣️ 情景例句
Two weeks. I said I could do it in two weeks, and I did it.
两周。我说过我两周就能完成， 现在我做到了。
Familiar paths and old friends are the best.
熟路好遵循，老友最可珍。
Take care of yourself.
照顾好你自己。