sky的意思的蓝天。

例句：

1、What's that in the sky？天上那是什么东西；

2、The sky suddenly went dark and it started to rain.天空骤然转暗，随即下起雨来；

3、the night sky.夜空；

4、a cloudless sky.无云的天空；

5、a land of blue skies and sunshine.一个蓝天丽日的国度；

6、The skies above London were ablaze with a spectacular firework display.伦敦上空礼花绽放，景象壮观。