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

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.

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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.

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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.

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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.

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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.

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This is the main reason everyone likes topspin.

这是每个人喜欢上旋的主要理由.

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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.

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Assuming your driving the ball or hitting with topspin.

假定你用力击球或以上旋球打击.

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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.

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He turned the little boy topsy-turning.

他把这个小男孩倒提着.

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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.

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Their scrapping the contract is turning all our arrangements for the performance topsy-turning.

他们毁约,打乱了我们所有的演出安排.

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The children turned the whole house topsy-turvy when their mother went out.

当母亲不在家时,孩子们把屋里都翻遍了.

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He left his room all topsy-turvy.

他把他的房间弄得乱七八糟.

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Don't turn the box topsy-turvy, the dish might fall out.

不要把箱子倒过来, 盘子会掉出来.

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The refusal of the actor turned all our arrangements for the performance topsy-turvy.

那个演员拒绝出台把我们整个演出安排都搞乱了.

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But that's only half the battle -- particularly in a year when finances are topsy-turvy.

但这仅是半场“战役 ” - 尤其在这个经济不景气的年头.

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When anything is topsy-turvy, it turns my stomach.

如果一切都乱七八糟, 就会使我倒胃口.

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The whole world's going topsy-turvy.

整个世界正变得颠三倒四.

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If you turn the envelope topsy-turvy, the key will fall out.

如果你把信封倒过来, 钥匙就会掉出来.

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