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a stone wall 石头墙
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rock多指“岩石”(不可数):
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The men broke the rock with gunpowder.工人们用炸药把岩石炸开。
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He built his house on rock.他把他的房子盖在山岩上。
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也可指“一块岩石”或“礁石”(可数):
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There are dangerous rocks in the road.路上有危险的岩石。
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Rocks fell down the hillside.岩石顺着小山滚了下来。
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The ship struck a rock and broke up.船撞在礁上破碎了。
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还可指(小)石块(特别是在美国):
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The angry mob began to throw rocks at the speaker.愤怒的群众朝演讲的人扔石块。
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Rocks were thrown and police came running.石块乱扔,警察跑着赶了过来。
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pebble指“鹅卵石”:
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I bruised my feet on the pebbles in the bed of the stream.我的脚被河底的鹅卵石撞紫了。
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Pebbles are rounded and smooth, unlike rocks or sharp stones.鹅卵石是圆形光滑的,不像岩石或锋利的石块。
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boulder指“圆形的巨石”:
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Huge boulders chocked the stream be.巨大的石块堵塞了小溪。
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846 stop
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stop可作不及物动词,表示“停止”:
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The rain has stopped.雨已经停了。
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My watch has stopped.我的表停了。
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The train stopped at a station.火车在一个车站停了下来。
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后面有时跟不定式作状语:
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He stopped to speak to Martin.他停下来和马丁讲话。
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We stopped to have a rest.我们停下来休息。
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