n.(坏事、暴力等的)温床
The city is a hotbed of crime.
这个城市是犯罪的温床.
The area was a hotbed of crime.
这个地区是犯罪活动的温床。
These are the seedlings that are hardening off in a hotbed.
这些是放在温床中经受耐寒锻炼的幼苗.