dredge pipe line
常见例句
- 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.
內容摘要：琯道被堵塞需要疏通，如果是用普通的人工清理方法在遇汙水或有毒琯道時不但髒且是很危險的，而大麪積泥土淤積時傚率很低或根本無法疏通。
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