Only 20 samples were not polluted among the 86 samples of 0~20 cm topsoil.

On the wide level acres of the valley the topsoil lay deep and fertile.

在山谷中广袤平坦的大地上,覆盖着厚实肥沃的土层.

Do you know what topsoil is made of?

你知道表土是由什么构成的 吗 ?

The topsoil has been almost completely washed away.

表层土壤已差不多完全给冲走了.

This causes environmental damage when the topsoil is washed away by the rains.

雨水冲走表层土壤会造成环境破坏。

The soils here are sandy and dominated by gravel topsoil.

那里的土壤是沙质化的,绝大部分是砂砾表层土.

No other animal is so useful in building up good topsoil.

蚯蚓对制造优良的表层土壤所起的作用是其他任何动物都比不上的.

Floods can remove fertile topsoil and begin a process resulting in the loss of planting areas.

洪水可以带走肥沃的表土层,最终导致种植区域的损失.

In many countries the loss of productive topsoil has contributed to growing food deficits.

在许多国家里,生产性表土的流失已导致日益严重的粮食短缺.

According to scientists, it takes nature 500 years to create an inch of topsoil.

根据科学家们的看法, 自然界要用500年的时间才能形成一英寸厚的表层土壤.

The fragile land quickly lost its topsoil and became nothing but sand and dust.

那单薄的土地很快就失去了表土,成为沙粒和尘埃.

When all topsoil is gone, nothing remains but a worthless desert.

当表层土流失后, 就只剩下一片无用的沙漠.

Under flood conditions, great amounts of topsoil are washed to receiving streams.

在洪水泛滥时, 大量表层土壤被冲刷到承受的水流中.

Erosion, the wearing away of topsoil by wind and rain, also contributes to water pollution.

侵蚀, 服装以外的表土被风和雨, 也有助于水污染.

The racquet face is a bit closed, so she'll generate some topspin.

她现在的拍面是闭合的, 因此她就可以加上点上旋.

This is the main reason everyone likes topspin.

这是每个人喜欢上旋的主要理由.

This is a natural motion and produces topspin on their shots.

这是一个自然的动作,并且能够在他们的回球上产生上旋.

Assuming your driving the ball or hitting with topspin.

假定你用力击球或以上旋球打击.

Topspin spin is when the ball is spinning over itself in the direction moving forward.

许多网球选手对于落地回击上旋球有误会.我将试着简略地阐明一下.

He turned the little boy topsy-turning.

他把这个小男孩倒提着.

Topsy would hold a perfect carnival of confusion , for some one or two hours.

托普西就会恣意胡闹上一、二个小时.