By summer 2009, it had found that the problem was caused by rust forming inside a high-pressure pipe in the power steering system.

直到2009年夏天，这一问题被发现是由于转向动力系统的高压管路生锈引起的。

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In the summer, the process reverses, with the pump sending water and glycol into the pipe to help cool the house.

在夏季，程序正相反，地热泵会将水与乙二醇送入管道中以帮助房屋内制冷。

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Last summer an 83-year-old pipe in Manhattan burst, sending a geyser of steam and debris into the air.

ECONOMIST: Infrastructure