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

The stagnant pond is a breeding ground for mosquitoes.腐臭的池塘是蚊子滋生的地方。