What's the difference between atrophy and involution?是什么意思？

What's the difference between atrophy and involution?

萎缩和退化的区别是什么?

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

difference

n. 差别，差异，[数]差数，差额，意见分歧，特色；vt. 辨别，区分；

例句
Contrary to popular belief, there is no evidence that what you look like makes much difference to your life.
和人们一般的看法相反，没有证据表明面相对人生有多大影响。

between

prep. 在…之间，私下，暗中，在…中任择其一，来往于…之间；adv. 当中，中间；

例句
How big is the abyss between what you think you are and what you actually are?
你对自己的认识和真实的你之间差别到底有多大？

atrophy

n. 萎缩，衰退；vt.& vi. （使）萎缩，（使）虚脱，（使）衰退；

例句
The wall is thin and almost transparent probably due to atrophy of the villi.
肠壁薄,几乎是透明的,这可能是因绒毛萎缩.

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

involution

n. 卷绕，回旋，复归，包卷，对合；

例句
Thymic involution caused by child abuse might lead to secondary immunodeficiency.
儿童虐待所致的胸腺退缩可能导致继发性免疫机能不全.