泥土堵塞的
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内容摘要：管道被堵塞需要疏通，如果是用普通的人工清理方法在遇污水或有毒管道时不但脏且是很危险的，而大面积泥土淤积时效率很低或根本无法疏通。
Brief: The pipe line is needed to dredge when it was blocked. It is very dirty and dangerous and lower efficiency or can not operate by manpower when the pipe line is waste or poisonous.
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