晴天的英文：
sunny

Lovely day
可爱的晴天

It's sunny,but the air is frosty.
虽然是晴天,但空气很冷.

Weather is changing all the time in mountain areas, Now it's fine, and then it begins to rain.
山区的天气真是变幻无常,刚才还是晴天,一会儿就下起了雨。

fair weather
好天气;晴天

Unbroken fine weather
连续不断的晴天

A long progression of sunny days
连续的晴天.

A red sunset signifies fine weather.
红红的晚霞是晴天的象征。

The weather bureau promised a sunny weekend.
气象局预报周末是晴天。

The weather forecast says it will be sunny tomorrow.
天气预报说明天是晴天。

An interlude of bright weather
一段间歇的晴天

a cheery hello; a gay sunny room; a sunny smile.
快乐的招呼；一个快乐的、充满阳光的房间；充满阳光的微笑。

a gay, sunny room
一间明快的、充满阳光的房间

Sunny weather alternated with rain.
天气晴雨相间。

It's a brilliantly sunny morning.
这天上午阳光灿烂。

If it were sunny and warm all the time,
如果老是阳光普照，气候温暖。