A new north-south line was opened in early October, and three more will be finished this summer, nearly doubling the total mileage of track.

10月初，新的南北线路开通，今年夏天，另外三个也会完工，使得总地铁里程数加倍。

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Second, the business case for the line: the projected doubling of long-distance rail use by 2043 seems ambitious.

第二是这条线路的商业案例，计划中的“在2043年之前长距离铁路使用翻一翻”听起来有些好高骛远。

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And credit for the stock's doubling since its October low is going to the new line of digital phones.

FORBES: Motorola inside

The 320-mile, bullet-straight line between the two cities needed 3, 000 bridges and 67 tunnels, doubling the estimated cost.

ECONOMIST: Hideo Shima

Ms Mayer found that although doubling the income of poor families would lift most children above the poverty line, it would have virtually no effect on their test scores and only a slight effect on social behaviour.

ECONOMIST: Can��t buy me love