关于under第四辑：

1. 处于某种情况之下，Everything is under control. 一切尽在掌握之中。He's trying to keep the situation under control.

2. 在某个时期，My computer is still under warranty. 我的电脑还在保修期。My girlfriend was born under Pisces. 我女朋友是双鱼座的