v.恶化；变质；衰退
Relation between the two corntuies have deteriorated sharply in recent week. 最近几周那两个国家间的关系严重恶化了。
Food is apt to deteriorate in summer. 食物在夏天容易变质。
The discussion deteriorated into a bitter quarrel. 这场讨论演变成了激烈的争吵。
His sight have begin to deteriorate. 他的视力已经开始下降。
