hot·bed
noun/ˈhɒtbed/
/ˈhɑːtbed/
[usually singular]- hotbed of something a place where a lot of a particular activity, especially something bad or violent, is happening
（坏事、暴力等的）温床 - The area was a hotbed of crime.
这个地区以前是犯罪活动的温床。
- The area was a hotbed of crime.