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莫斯科发明了一种维修旧下水管道的新方法。在替换旧排水管时无需挖沟,也不用吊车和挖土机。只需打开排水孔,把一种和消防水管有些相像的东西塞进去,再用水蒸气给它加热,它很快就变成管状,3小时后变硬。它由玻璃钢制成,结实可靠,其寿命可达10
Moscow invented a new method of repairing old sewers. There is no need to dig trenches when replacing old drains, and no cranes or excavators are required. Simply open the drain hole, stuff something that resembles a fire hose, and heat it with water vapor. It quickly becomes tubular and hardens after 3 hours. It is made of fiberglass, strong and reliable, its life can reach 10