Sewage Treatment(18.污水处理)

Assoonasearlypeoplesestablishedsettlementtheyhadtheproblemofgettingridofsewage——theirorganicwastesand,sometimes,thoseofdomesticanimals.Naturedisposesofsurplusorganicmaterialinfourprincipalwaysbydilution,oxidation,putrefaction,andfiltration.Earlypeoplesreliedonthesenaturalprocessesandgenerallydump ......(共5829字)[阅读本文]>>

更多同类【建筑施工英语】......
科普知识