秧苗上面覆盖着塑料薄膜。
覆盖它的是塑料薄膜。
在扦插苗圃用不同颜色的塑料薄膜进行覆盖，观察地温、气温和空气湿度的变化对扦插苗发根的影响。
By covering tea cutting stock with various plastic film and observing the effect of different soil-temperature atmospheric-temperature air-humidity on the rooting of tea cutting.
塑料薄膜覆盖提高苗床的土壤温度，促进作物较快发育并提早成熟。
Plastic mulch increases soil temperature in the bed which promotes faster crop development and earlier yields.
在美国，虽然塑料薄膜覆盖主要用于蔬菜生产，但对任何可以获得效益的作物都可行。
Although mulch is used primarily for vegetable production in the United States, it is a viable concept for any crop where profitability can be demonstrated.
使用塑料薄膜覆盖，可以防止跑墒。
Plastic sheeting is used to cover the soil to prevent loss of moisture.
塑料薄膜覆盖可以形成防止烟熏气体逸散到大气的屏障，所以提高烟熏气体的杀虫效果。
Plastic mulches create a barrier preventing fumigant gases from escaping to the atmosphere, thereby increasing their effectiveness.
相反，加利福尼亚中部的草莓种植者并没有获益于提早收获的市场优势，但塑料薄膜覆盖广泛用于其它目的，特别用于提高果品品质。
On the other hand, strawberry growers in central California do not benefit from earlier harvest market-wise, but plastic mulch is widely used for another purpose, specifically fruit quality.
在铺上水泥之前，另外一层毛毡和一层塑料薄膜再覆盖在焊好的铜板上。
Another layer of felt is laid on top and finally a plastic vapor barrier is applied before the finish concrete is poured.
在铺上水泥之前，另外一层毛毡和一层塑料薄膜再覆盖在焊好的铜板上。
Another layer of felt is laid on top and finally a plastic vapor barrier is applied before the finish concrete is poured.
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