A disco isn't exactly a den of iniquity.是什么意思？

A disco isn't exactly a den of iniquity.

迪斯科舞厅并非藏污纳垢之处。

disco

n. 迪斯科舞厅，迪斯科舞会，的士高；

例句
Guests bopped and jigged the night away to the disco beat.
客人们整个晚上随着迪斯科的节奏跳博普舞和吉格舞。

exactly

adv. 精确地，确切地，完全地，全然，恰恰；

例句
'So it's not a family show then?' —'Well, actually, I think that's exactly what it is.'
“那么这并不是一次家庭才艺表演了？”——“嗯，事实上我觉得这恰恰就是一次家庭才艺表演。”

den

n. 兽穴，贼窝，简陋污秽的小室，书斋；vi. 穴居，藏到洞里，进窝（冬眠），把…赶入洞中；

例句
...the one-bedroomed flat that was to become his den of savage debauchery.
即将成为他野蛮放荡之所的一居室公寓

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

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

iniquity

n. 邪恶，极不公正；

例句
I remembered that I was a Carolinian, from a State which framed this iniquity by law.
我心头一沈,想到自己是在这一切令人厌恶的事物生长起来并接受教育的.