名词
中文翻译：云层的数量或密度同义词
同义词：
['cloud cover', 'cloudiness']
例句：
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1. The weather forecast predicts a clear sky with high cloud cover.
天气预报预测晴朗的天空，云层较高。
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2. The mountain range is covered in thick clouds during the winter.
山区在冬天被厚厚的云层覆盖。
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3. The cloud layer is thinning as the sun rises.
随着太阳升起，云层变薄了。