Derival
n. =derivation
🗣️ 情景例句
Don't let us keep you from your math tutoring, Robbie.
别让我们妨碍你的数学家教， Robbie。
If you're sure you're not in a hurry, I can use a little help.
如果你真的不忙的话，我可能要你帮个小忙。
What will be the population of these countries in the year 2000?
2000年不太发达国家的人口将是多少？