sky是可数名词吗

sky双语例句：

A red sky at night often indicates fine weather the next day.

夜空呈红色往往预兆第二天天气晴朗。

The stars were points of light in the sky.

天空中的点点光亮就是星星。

Several people described seeing strange lights in the sky.

好几个人都说看到天上出现了奇异光芒。

The sky suddenly went dark and it started to rain.

天空骤然转暗，随即下起雨来。

The sun was low in the sky.

太阳低挂在天空。