deteriorate词根记忆

　　After a few years' planting, the quality of the potato crop deteriorates.

　　土豆种了几年之后就会退化。

　　Food is apt to deteriorate in summer.

　　食物在夏天爱变质。

　　It is saddening to see that relations between the two countries should have deteriorated to the present state.

　　两国关系恶化到今天这个地步，是令人痛心的。

　　Relations between the superpowers have deteriorated sharply in recent weeks.

　　在最近几周超级大国间的关系急剧恶化。

　　Air pollution is deteriorating in many places around the world.

　　世界上许多地方的空气污染正在恶化。