伴随我国工业化的快速发展，大地不断遭到各种污染的伤害。污染的加剧导致土壤中的有益菌大量减少，土壤质量下降，自净能力减弱，影响农作物的产量与品质。土地受污染变成了“毒土”。据统计，我国有2000万公顷耕地受到重金属污染，这些“毒土”约占耕地总面积的1/ 5。
用甲基异柳磷毒土围苗等药杀幼虫是田间防治控制危害的重要手段。
To spread the mixture of poison insecticide soil on the land near maize plant is an important method to control larve in the field.
他们必因饥饿而衰弱，必为热症、毒疫所消灭；我还使尖牙的野兽和土中爬行的毒虫伤害他们。
Emaciating hunger and consuming fever and bitter pestilence, and the teeth of wild beasts I will send among them, with the venom of reptiles gliding in the dust.
他们必因饥饿消瘦，被炎热苦毒吞灭。 我要打发野兽用牙齿咬他们，并土中腹行的，用毒气害他们。
They shall be burnt with hunger, and devoured with burning heat, and with bitter destruction: I will also send the teeth of beasts upon them, with the poison of serpents of the dust.
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