晴空的英文：
clear sky; cloudless sky

参考例句：

He was gazing at the serene sky.
他凝视着晴空。

The sun glaring(down)mercilessly from a clear sky
透过晴空太阳正毒.

He stood beside her peering up at the clear sky.
他站在她的身旁，凝视着晴空。

The cloudless sky was jewelled with myriads of glittering stars.
无云的晴空镶嵌着无数颗闪烁的星星。

The water before them, illumined by the sunset, had become the deep clearblue of the sky on a summer evening.
落日的余辉似乎也把他们眼前的海水照亮了，一派清澈湛蓝，宛如夏晚的晴空。

clear是什么意思：
adj. 清澈的；清晰的；明确的；晴朗的，明亮的；无瑕疵的；畅通的
adv. 清晰地；完全地
v. 变清澈；使清楚；扫除，清除；清（嗓子）；跳过，通过；结清；放晴

attacking clear
比较平直的高远球

clear an account
结清帐户|清帐

To clear as profit.
净得利润

sky是什么意思：
n. 天，天空

The sky is clearing.
天正明朗起来。

Sky is louring.
天空正变得阴沉。

After the storm the sky cleared.
暴风雨过后，天空明朗了。