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matter 物质 energy 能 vacuum 真空 liquid 液体 fluid 流体 solid 固体 body 物体 mass 质量 weight 重量 density 密度 specific gravity 比重 gravity 重力 velocity 速度 kinetic energy

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Americans are worse at spelling than Britons, with more than half unable to spell embarrassed, liaison and millennium。 美国人在拼写单词方面不如英国人，超过一半的美国人不会拼embarrassed、liaison和millennium。 Despite th

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Next time youre sitting in the tub, try the following experiment. Stand up quickly, being careful not to fall over. The water will slosh over to fill in the place where your body was, and then slosh back in the other direction, and so on. You have cr