early warning的用法和样例：
例句
用作名词 (n.)
- Basic early warning systems are being set up in the affected areas.
受灾地区将会安装预警系统。 - Don't worry, we have a tsunami early warning system.
别担心，我们有海啸预警系统。
词汇搭配
- early warning system 预先警报系统...
