Many microorganisms possess the ability to dehydrohalogenate DDT to DDE.许多微生物使滴滴涕脱卤化氢变为滴滴依.The house is regularly spraying with DDT.房屋是定期用DDT喷洒.The insects can be exterminated by spraying DDT.可以用喷撒滴滴涕的方法大量杀死这种昆虫.Thousand...
无技能的工人通常比有技能的工人挣钱少.Unskilled workers usually earn less money than skilled workers.随着经济转向生产,对普通无技能的劳工需求减少.As the economy has shifted towards production there is less demand for ordinary, unskilled labor....