decays
v.
（使）腐烂，腐朽( decay的第三人称单数 );
衰败，衰退，衰落;
例句:
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A specimen which is much thicker than the penetration depth decays exponentially.
一个比穿深透度厚得多的样品,按指数律衰减.
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The nucleus decays into three particles which go off in separate directions.
这个核衰变成飞向不同方向的三个粒子.
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From this point onward the glory of the Omayyad line decays.
从此以后,倭马亚家系的繁荣就衰落了.
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This strong-smelling trail decays quickly, lasting just six minutes.
来自BBC
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Do these decays pertain to different experiments?
来自SA
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Language is not a plant that rises and falls, lives and decays.
来自BBC