Grammar Note
通常说 the sky；复数形式 skies 多用于描述天气或不同地方的天空。
天空；天
skies — plural of sky
先理解核心含义，再看它在真实句子里的用法。
天空；天
The space above the earth where the sun, moon, stars, and clouds are seen.
The sky was clear and blue all morning.
整个早上天空晴朗湛蓝。
地球表面上方的天空,太阳、月亮、星星和云朵可见的地方
The atmosphere above a given point, especially as visible from the surface of the Earth as the place where the sun, moon, stars, and clouds are seen.
从地球上看到的大气层和外层空间
the atmosphere and outer space as viewed from the earth
从特定地点或时间可见的天空部分及其气候、状况等
With a descriptive word: the part of the sky which can be seen from a specific place or at a specific time; its climate, condition, etc.
通过时空中给定点的所有光线方向的集合
The set of all lightlike lines (or directions) passing through a given point in space-time.
Dark clouds moved quickly across the sky before the storm.
暴风雨来临前，乌云快速地掠过天空。
We watched the stars come out in the night sky.
我们看着星星在夜空中出现。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
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通常说 the sky；复数形式 skies 多用于描述天气或不同地方的天空。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 3，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.