As the grinding goes on, the pieces get small. Over a long time, tiny grains of sand are made.

在风浪的冲刷下，这些碎粒被磨得越来越小，很久以后就形成了很小的沙粒。

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If so, the mortgage crunch will be a grinding drag on America's economy; one that unfolds over several years, hitting some people and some regions hard, but not, in itself, a macro-economic disaster.

如果这样的话，贷款危机是美国经济的一大拖累；这会在几年内展现，对一些人和地区造成沉重的打击，但本身不会是一次宏观经济的灾难。

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Researchers surmise that over billions of years the debris should collide, grinding the KBO-type objects down to ever smaller pieces that were not part of the original Kuiper Belt population.

研究人员推测数这些碎块经过数十亿年的互相碰撞，柯伊伯型天体磨得更碎，柯伊伯带原始状态不再。

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Williams' absence increases the chances of world No. 4 Agnieszka Radwanska making a successful defense of her title, which began with the Pole grinding out a 7-, 6-3 win over Yulia Putintseva, a promising 18-year-old wild card entry from Kazakhstan.

CNN: STORY HIGHLIGHTS