名词
中文翻译：天空覆盖物
同义词：
['overhead cover', 'sky cover', 'overcast']
例句：
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1. The sky cover is so thick that it blocks out the sun.
天空覆盖物太厚了，以至于挡住了太阳。
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2. The sky cover was so dark that it made it difficult to see the stars.
天空覆盖物非常黑暗，使得看星星变得困难。
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3. The sky cover was so thick that it blocked out all of the light from the sun.
天空覆盖物非常厚，以至于阻挡了所有的阳光。