名词
中文翻译：退化
同义词：
['decrepitude', 'decadence', 'degeneration']
例句：
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1. The population has been declining steadily for decades.
人口几十年来一直在下降。
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2. The old building is in a state of degeneracy due to neglect.
由于忽视，这座老建筑处于退化状态。
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3. The species faces the threat of degeneracy due to habitat loss.
由于栖息地丧失，物种面临退化的威胁。