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There was some sludge at the bottom of the tank.
油箱底有油泥。
《牛津词典》
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Study on Technology of Oil Recovery from Oily-Sludge of Tank Bottom;
可以清除罐底，恢复油罐容量，且无须停车。
youdao
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Study on Technology of Oil Recovery from Oily-Sludge of Tank Bottom;
可以清除罐底，恢复油罐容量，且无须停车。
youdao