v. 退化，恶化（deteriorate 的 ing 形式）
1.One reason is the deteriorating economic outlook.
原因之一是日益衰败的经济前景。
2.With their support system deteriorating, the photoreceptors die too.
随着支持系统的消逝，感光层随之死亡。
3.Russia's Ties with NATO deteriorating.
俄与北约合作被冻结关系降至低点。
4.Their language is deteriorating.
他们的语言正在恶化。
5."The health of ecosystems on which we and all other species depend is deteriorating more rapidly than ever," Robert Watson said.
罗伯特·沃森说：“我们和其他所有物种赖以生存的生态系统的健康正以从未有过的速度恶化。”
6.In my point of view, we are in a prime time to curb the problem from deteriorating.
在我看来，我们正处在阻止问题恶化的黄金时期。