"overcast" in Chinese (Simplified)
阴天
Definition
天空被云完全覆盖，白天灰蒙蒙的，没有阳光直射。
Usage Notes (Chinese (Simplified))
常见于天气预报和日常谈论天气时。'overcast' 表示天空完全被云层覆盖，不等同于 'cloudy'（多云）。它通常不代表下雨，只是一种灰蒙蒙的天空。
Examples
The sky is overcast today.
今天是**阴天**。
It was cold and overcast in the morning.
早上又冷又是**阴天**。
The weather forecast says it will be overcast all afternoon.
天气预报说整个下午都会**阴天**。
It's so overcast I can barely see the sun at all.
天太**阴**了，几乎看不见太阳。
Don't forget your jacket—it's pretty chilly and overcast out there.
别忘了带外套，外面很冷而且是**阴天**。
Everything looks a bit gloomy when it's this overcast.
这种**阴天**下，一切看起来都有点阴郁。