Plastic sheeting is used to cover the soil to prevent loss of moisture.

使用塑料薄膜覆盖，可以防止跑墒。

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Many perennial ground cover plants, such as ivy, periwinkle, pachysandra, mondo grass and liriope, will cover the soil and act as a mulch.

许多多年生地被植物如常春藤、蔓长春、富贵草等等，能够形成良好的地面覆盖效果。

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They have also learned how to better preserved the precious surface water by using the thin film to cover the soil so that the evaporation of the moisture from the ground can be minimized.

他们也学会了用薄膜盖住土地，这样可以最大程度地防止水分的蒸发，以达到保持住弥足珍贵的地表水的目的。

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If possible, in the year before you plant potatoes, plant a cover crop to improve the soil and the potato production.

VOA: special.2009.03.10

If a test finds that soil has too much lead, you might be advised to remove the soil or cover it with sod grass.

VOA: special.2009.06.09

Wavoka warned that new soil ould rise up and cover the world like a flood.

VOA: special.2010.04.08

Black polyethylene mulching involves the plants growing through holes in plastic sheets that cover the soil.

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"When you increase the shrub cover you trap more snow, which keeps the soil warmer, " said Sturm, calling by cellphone 70 miles east of Nome, Alaska, in a small village that serves as his base to study seasonal snow changes.

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They will record plant species, forest structure, ash cover, soil properties, river sediment and the overall topography of the burned area.

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