潰爛在不知不覺間的蔓延英文怎麼說？

the insidious growth of decay

糖果會蛀蝕牙齒英文怎麼說？

Sweets can decay the teeth.

他的智力衰退令人苦惱英文怎麼說？

His mental decay is distressing.

生長和衰亡是生命過程英文怎麼說？

Growth and decay are vital processes.

他們在想辦法阻止這古老建築的朽壞英文怎麼說？

They are figuring out a way to stop the decay of the ancient building.

牙齒的蛀洞是由蛀蝕造成的英文怎麼說？

Cavities in teeth are caused by decay.