名词
中文翻译：衰变
同义词：
['decrease', 'deteriorate', 'decompose', 'decay']
例句：
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1. The old tree is showing signs of decay.
这棵老树开始出现衰败的迹象。
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2. The soil around the plant is starting to decay.
植物周围的土壤开始腐烂。
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3. The food in the refrigerator has started to decay.
冰箱里的食物已经开始变质了。