Precalculus
a. & n.学习微积分前必修的(课程)
🗣️ 情景例句
but I'm restless.
但我闲不住。
They that do nothing learn to do ill.
游手好闲，容易学坏。
We're going to substitute a better item for number 3.
我们将以品质较好的来代替三号产品。