a piece of 哪些比如a piece of

a piece of 哪些比如a piece of paper a piece of cake

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I was hurt by a piece of falling masonry.我被掉下来的一块建筑用石块砸伤.The teacher gave each of us a piece of filter paper before doing the experiment.做试验前,老师给我们每个人发了一张滤纸.He found a...