(狮子、狐狸等野生动物的)兽穴,兽窝 A den is the home of certain types of wild animals such as lions or foxes.
(家里用来学习、工作或从事业余爱好的)书房,私室 Your den is a quiet room in your house where you can go to study, work, or carry on a hobby without being disturbed.
N-COUNT (通常指为了从事非法活动的)秘密聚集处,窝点,巢穴 A den is a secret place where people meet, usually for a dishonest purpose.
I could provide you with the addresses of at least three illegal drinking dens. 我可以为你提供至少 3 处非法饮酒窝点的地址。
...the crack dens of urban America. 美国城市中的可卡因毒窟
N-COUNT (某一不良行为或非法活动的猖獗)场所,渊薮 If you describe a place as a den of a particular type of bad or illegal behaviour, you mean that a lot of that type of behaviour goes on there.
...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