高中英语module5alessoninalab课件外研版必修1内容摘要：
re very mon, too. There are many examples. You can make a physical change by tearing a piece of paper into two, or by cutting a piece of iron with a lathe(车床 ). Here paper is still paper, and the iron is still iron. Another way of making physical change。阅读剩余 0%
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