Precalculus
a. & n.学习微积分前必修的(课程)
🗣️ 情景例句
Drug dependence should be looked at as a medical issue, not a criminal one.
毒品信赖应该被看成是医学问题，而不是犯罪问题。
The first step to virtue is to abstain from vice.
避开作恶是走向美德的第一步。
It's up to you to decide.
这主要取决于你。