Introduces
介绍
🗣️ 情景例句
Turn the key before you pump the pedal, or you'll flood the engine.
加水之前转动钥匙，要不发动机就给浇灭了。
In universities,students train to become teachers and engineers.
在大学里，学生们被训练成为教师和工程师。
We had it after school.
我们放学后开的。