减退的英文：
corrosion
falloff
letdown
slack up

参考例句：

Hypo-ovaria; hypoovarianism
卵巢功能减退

Were there occasions when enthusiasm ebbed?
会有热情减退的时候么？

A professional massage technique is applied on eyes to diminish puffiness, eye bag, dark circles caused by tiredness.
特别为眼部而设的专业按摩手法，减退因疲劳而引起的浮肿，眼袋及黑眼圈。

Disorders affecting the retina or the macula in its centre decrease vision and can cause blindness.
影响视网膜和中心黄斑的病变会减退视力并可导致眼盲。

Their enthusiasm began to remit.
他们的热情开始减退。

His strength dissolved.
他的体力减退。

His eyesight was beginning to fail.
他的视力开始减退。

Public confidence in the President is at a low ebb.
民众对总统的信心在减退。

His eyesight is going.
他的视力在减退。

My interest in music has languished slightly.
我对音乐的兴趣有点减退。

corrosion是什么意思：
n. 腐蚀；受腐蚀的部位；腐蚀产生的物质

It is extremely corrosive.
它是极强的腐蚀剂。

The batteries also resist corrosion.
该种电池也能抗腐蚀。

Sodium and sulphur are highly corrosive.
钠和硫磺腐蚀性很强。

falloff是什么意思：
n. 下降,减退;分开,排出
letdown是什么意思：
n. 失望,令人失望的事物;松劲;下降,减退;下降,减低

Not getting an invitation to the party is a big letdown for Jill.
没有接到参加晚会的邀请，吉尔感到十分失望。

It was a big letdown when I was not accepted by Harvard university.
当我的入学申请被哈佛大学拒绝时，我失望极了。

It was a big letdown when I wasn't accepted by Harvard University.
〞当我的入学申请被哈佛大学拒绝时,我失望极了。〞