名词
中文翻译：Unknown
同义词：
['clean', 'clear', 'transparent']
例句：
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1. The room was cleaned up after the party.
派对结束后，房间被打扫得干干净净。
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2. The sky is crystal clear today.
今天的天空非常清澈。
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3. The river is so transparent that you can see fish swimming through it.
这条河如此清澈，可以看到鱼儿在水中游动。