a breeding ground for sth
(for bacteria, germs)繁殖地；繁殖场所
Warm milk is the ideal breeding ground for bacteria.温牛奶是细菌繁殖的绝佳场所。
workers whose vile living conditions were a breeding ground for germs居住在易滋生病菌的恶劣环境中的工人
(for insects, mosquitoes)繁殖地；滋生地
The stagnant pond is a breeding ground for mosquitoes.腐臭的池塘是蚊子滋生的地方。