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名词
n. （金属、玻璃等做的）管子
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long,thin pipe of metal,glass,or rubber
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The steel tubes were clogged with dirty matters.
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钢管里塞满了脏物。
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名词
n. 容器；管状物
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container of soft metal, plastic, etc.with a hole and lid at one end
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There is a rubber tube inside a bicycle tyre.
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自行车的轮胎里有一个橡胶内胎（内带）。
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名词
n. 地下铁道
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underground railway
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They travel to work by tube.
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他们乘地铁去上班。
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