地膜污染；
那样长的时间里，地膜污染给我们造成的损害是无法挽回的！
In such a long time of self-promotion, the film pollution will do a damage we can not reverse!
随着地膜覆盖栽培年限的延长，由于残膜回收率低，土壤中残膜量逐步增加，造成地膜污染。
Along with mulching fixed number years lengthening, because of remains film recovery rate is low, the amount of remains film in the soil progressively increase and cause film pollution.
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