Many PAHs are carcinogenic or are suspected to be carcinogenic.其主要来源于煤的不完全燃烧,也有相当部分来源于汽车尾气的排放.The both carcinogenic factors were investigated on its dose - response ralationships.研究上述两种致癌因子的剂量 - 效应相关模式.Some industrial ch...
A terrible restlessness that was like to hunger afflicted Martin Eden.一阵可怕的、跟饥饿差不多的不安情绪折磨着马丁·伊登.Martin Parry, author of the report, says it's time for concerted action by world leaders.该报道的作者马丁·帕里宣称是世界各国的首脑采取一致行动的时候...
The Swedes had sought his freedom through quiet diplomacy...瑞典人通过秘密的外交手段来争取他的自由。The Swedes do not have Santa Claus. What they have is Christmas Gnome.瑞典人的圣诞节里没有圣诞老人,但他们却有一个圣诞守护神。The Swedes had sought his freedom through ...