When winds blow sand particles against a large rock for a long time, the softer layer of the rock are slowly worn away.
由于风将砂粒刮起来，碰撞大岩石，久而久之，较松软的岩石层就被慢慢地磨损。(只能译成“较”，不能译为“更”)。
He carried a big stick which had seen many seasons, and a pair of sand-shoes, rather worn out.
他拄着一根年代久远的大手杖，穿着一双相当破旧的沙地鞋。
He carried a big stick which had seen many seasons, and a pair of sand-shoes, rather worn out.
他拄着一根年代久远的大手杖，穿着一双相当破旧的沙地鞋。
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