例如成本低廉的灌溉方式已经使印度很多地区的地下水干涸，化肥中高剂量的盐分残留在土壤内。

For example, cheap forms of irrigation have depleted the water table in many farm areas of India, while at the same time adding near-toxic levels of salts from fertilizers to the soil.

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这些残留必须彻底清除。 先用高压淡水清洗除去螺旋桨表面的灰尘污垢和微量盐分。

The silicone anti foulingpainting system needs high requirements on the surface's cleanliness, So these residue must be cleared.

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