pagrimums 用英语:

Organic material creates gas as it decays.

tooth decay

Some day they will find me lying in neglect and decay.

Mere decay produces richer life.

Many local traditions have fallen into decay in recent years.

Two great civilizations slowly fell into decay.

Fruits decay in the sun.

The decay of the shrine is due, in part, to acid rain.

Most fruits and vegetables start to decay after a week.

My tooth was totally decayed, so my dentist decided to extract it

My teeth are going to decay if I keep eating sweets and drinking cola.

decay of buildings, decay of standards, decay of morals

When organic materials decay under the action of naturally occuring bacteria, methane gas is produced.

Since fluorine has been added to tap water tooth decay is less common among children.