Even at the age of 39, with a mortgage, two sick kids and a leaking pipe in the laundry room, the clown in the movie Poltergeist still gives him the creeps.
即使39岁还有贷款在身，两个生病的孩子和洗衣房里漏水的水管，这部片子里的小丑“吵闹鬼”仍旧带给他恐惧之感。
This article research from the status quo at home and abroad, the basic concept of calculation methods, the water pipe network in the age of a detailed analysis.
从国内外研究现状、基本概念、计算方法等方面对管网中的水龄进行具体分析。
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