中情局有化工厂的土壤样品，在里面发现了制造VX神经毒气的化学成分。
The CIA had soil samples taken at the plant site that contained the chemical used to produce VX.
土壤温度、微生物数量和枯枝落叶本身的化学成分是影响分解率的主要因素。
The soil temperature, the Numbers of microorganism and the chemical composition of litter itself are the main factors what affect the litter decomposition rate.
以大兴安岭北部地区为例，研究了浅覆盖区土壤与基岩化学成分的关系。
Taking the northern Da Hinggan Mountains for example, the relation between the chemical compositions of soils and bedrocks in shallow overburden areas is studied.
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