During the seventeenth and eighteenth centuries, the entire site became covered with a layer of hard grey clay, which minimised further erosion.

在十七世纪和十八世纪，整个遗址被一层坚硬的灰色粘土覆盖，这极大减少了进一步的侵蚀。

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That prevents Spain from constructing super-slow clay courts, or the United States from designing lightning-quick hard ones, to suit their own players' preferred styles.

这就阻止了西班牙和美国为了偏向本国球员的球风而建造超级慢的红土球场和设计出轻快的硬地球场。

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Andy Roddick could get Igor Andreev, a player he's lost to on hard and clay courts in the past, in the second round.

第二轮，罗迪克与安德·列夫宣战，他在硬地和红土上，曾是自己的手下败将。

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Henry Clay said the campaign was a struggle between log cabins and palaces, between hard cider and champagne.

VOA: special.2009.01.22

The kinds of minerals in clay affect how soft or hard it is to work with.

VOA: special.2009.09.09

But to the South,Clay said, it was a hard social and economic fact.

VOA: special.2009.03.19

Djokovic is now aiming to become the first player to win back-to-back ATP Masters 1000 titles in Miami and Monte Carlo, saying he is well prepared for the transition from hard to clay courts.

CNN: STORY HIGHLIGHTS

The maths of the clay surface are distinctly different to grass or hard-court surfaces.

CNN: Tennis interactive: Why clay is so different

The region's hard-packed clay soil welcomes a unique mix of plants with deep-penetrating root systems.

WSJ: Meadows Instead of Lawns Are in Fashion in Residential Landscaping