拆分记忆法：
云cloud聚集在一起的 + y 构成形容词，表性质 -> cloudy 多云的
adj. 多云的；阴天的；愁容满面的
It's cloudy. It is going to rain.
天气多云，要下雨了。
Cloudy days are bad for traveling.
阴天不适合旅行。
It was cloudy for most of the day.
这天中大部分时候都阴天。
Cloudy days are bad for traveling.
阴天不适合旅行。
It was a really cloudy morning.
这是个多云的早晨。
