颓疝的英文：
swelling of the scrotum

swelling是什么意思：
n. 身上的肿胀处；膨胀，浮肿

The sun will swell into a red giant.
太阳将膨胀为一颗红巨星。

There was a swell in the city's population.
该市出现过人口膨胀。

I think this is a swell hotel.
我觉得这家饭店非常好。

double swell hand
二段式指针

The infection swelled his hand.
感染使他的手肿了起来。

scrotum是什么意思：
n. 阴囊

A developmental defect marked by the failure of the testes to descend into the scrotum.
隐睾病一种睾丸未能缩回阴囊内的发育缺陷