in the sky
表示某物位于天空之中时，常用介词 in；若要表达“在天空之下、被天空笼罩”，则用 under the sky。
There wasn't a single cloud in the sky.
天空中一片云也没有。
（某地某时的）天空；天色；（物理学）光方向集；地球表面上方的天空,太阳、月亮、星星和云朵可见的地方；从地球上看到的大气层和外层空间；从特定地点或时间可见的天空部分及其气候、状况等
The space above the earth where the sun, moon, stars, and clouds are seen.
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.
The sky was clear and blue all morning.
整个早上天空晴朗湛蓝。
用法提示：sky 作名词，指肉眼可见的天空。
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。
用法提示：sky 作名词，是句中 across 的宾语，表示天空这个区域。
We watched the stars come out in the night sky.
我们看着星星在夜空中出现。
用法提示：night sky 中 sky 作名词，表示夜空。
表示某物位于天空之中时，常用介词 in；若要表达“在天空之下、被天空笼罩”，则用 under the sky。
There wasn't a single cloud in the sky.
天空中一片云也没有。
描述天色变化时，常用 turn、go、grow 等系动词，后接表示颜色或明暗的形容词。
The sky turned grey before the storm.
暴风雨来临前，天色变得灰暗。
sky 作可数名词时，前面可加形容词描述天气状况，如 a clear blue sky、a cloudless sky。
We woke up to a clear blue sky.
我们醒来时，天空一片蔚蓝。
复数 skies 常用于文学或较正式的表达，指某地或某时的天空，如 under foreign skies。
The birds flew south under grey skies.
鸟儿在灰暗的天空下向南飞去。
grammar · medium
易错句子The moon is on the sky.
正确表达The moon is in the sky.
英语表示“在天空中”用固定搭配 in the sky，介词用 in；汉语说“在天空上”，容易把“上”直译成 on，应改为 in。
grammar · medium
易错句子Look at sky! It's full of stars.
正确表达Look at the sky! It's full of stars.
sky 是可数名词，特指眼前这片天空时前面必须加定冠词 the；汉语没有冠词系统，学习者容易漏掉 the。
grammar · medium
易错句子The sky are full of stars.
正确表达The sky is full of stars.
主语 sky 是单数名词，谓语动词要用 is；汉语动词没有单复数变化，学习者容易受复数意思影响误用 are。
蔚蓝的天空
The children flew kites under a clear blue sky.
孩子们在蔚蓝的天空下放风筝。
夜空
We lay on the grass and watched the night sky.
我们躺在草地上看夜空。
空中楼阁；不切实际的空想
His plan to get rich overnight is just pie in the sky.
他一夜暴富的计划不过是空中楼阁。
前途无量；一切皆有可能
If you keep working hard, the sky's the limit.
只要你不断努力，前途不可限量。
把某人捧上天
The critics praised her performance to the skies.
评论家把她的表演捧上了天。
在露天；在户外
They slept under the open sky that night.
那天晚上他们露宿在露天。
Choose the next layer that will help you use sky with more confidence.
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