the sky,the heavens,sphere,welkin,firmament,empyrean,
heaven,skies,cloud,air
Examples:
1. 她抬起头来,凝望着十二月份阴沉沉的天空。
She looked up staring at the sombre December sky.
2. 云是天空中的水汽团。
A cloud is a mass of vapor in the sky.
3. 暴风雨来临时,天空转暗。
The sky turned dark as the storm came near.
4. 天空慢慢由蓝色变为红色。
The sky slowly changed from blue to red.
5. 落日把天空染成金色。
The setting sun gilds the sky.
6. 他抬起头,凝望着天空。
He rose his head and stared at the firmament.
7. 清澈的水中映出蔚蓝的天空。
The clear water mirrored the blue sky.
8. 太阳看起来在天空以弧线运行。
The sun appears to move in an arc across the sky.
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