Take a look at your day. The roof of your home is probably made waterproof by an oil product, bitumen. The same product is used for the road surface outside your home.
英
美
释义
请看一看你的日常生活。你家的屋顶可能是用一种叫沥青的石油产品做成防水的。沥青同样可用来铺你家外面的路面。
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