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.

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.

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.

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.

He left his room all topsy-turvy.

他把他的房间弄得乱七八糟.

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.

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.

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.

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.

The whole world's going topsy-turvy.

整个世界正变得颠三倒四.

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.