温床

Air-conditioning ducts create a perfect breeding ground for Legionnaire's disease bacteria.

空调系统输送管则是军团病细菌绝佳。

The city is a hotbed of crime.

这个城市是犯。

"Modern cities are a window of modern civilization and, at the same time, a hotbed of crime."

"现代城市是现代文明窗口,同时又是犯。"

The ichneumon wasp paralyses its prey without killing it and lays its larva inside this convenient source of fresh meat, to eat it slowly alive.

姬蜂，黄蜂使猎物麻痹而不是杀死他们，并将它们为他们幼虫，并慢慢从他们吸收养分。