Results: The density indexes of rats and cockroaches in 2001 increased by 1.05 and 1.56 respectively than in 2000, while the density indexes of mosquitoes and fli...是什么意思_Results: The density indexes of rats and cockroaches in 2001 increased by 1.05 and 1.56 respectively than in 2000, while the density indexes of mosquitoes and fli...在线翻译_英语_读音_用法_例句