warren指“兔子窝”或者“拥挤的街区”，众所周知，兔子繁殖能力很强，一窝兔子十分拥挤。所以rabbit warren也用来指代非常拥挤和混乱的建筑物或城市中容易迷路的部分；街道狭窄而密集的城区。

【例句】
That whole North Castle area is a rabbit warren.
整个北堡地区人口稠密。

Unable to find a bed and unimpressed by the rabbit warren of slapdash buildings, Ms. Liu scowled as the smell of trash wafted up around her.
刘小姐找不到床，对周围杂乱的建筑物也感到厌烦，垃圾的臭味飘荡在她周围，她皱起了眉头。