decay例句

When not removed, plaque causes tooth decay and gum disease.
牙斑如果不清除就会导致牙齿蛀蚀和牙龈疾病。

There are problems of urban decay and gang violence.
存在城市衰败和帮派暴力的问题。

The phosphate was deposited by the decay of marine microorganisms.
海洋微生物腐烂后沉积形成磷酸盐。

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