英语语法分析

The residue of DDT in soil is rather high due to the application of the pesticide Kelthane to prevent and kill red spider on the wheat field and the pesticide Kelthane contains DDT.

土壤中滴滴涕残留量偏高，是由于防治红蜘蛛时施用三氯杀螨醇，而三氯杀螨醇原药中含有滴滴涕所致。