Just the opposite happened in the us, where a recovery that looked on track in the first quarter of 2010, suddenly stalled in May and June.

而在美国情况相反，2010年第一季度看似上了轨道的经济复苏在五月六月嘎然而止。

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The subway is undergoing repairs, and sometimes trains going in opposite directions take turns using the same track.

地铁正在进行维修，有时两列对开的地铁只能轮流共用一条轨道。

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If you learn to recognize and track your mental state, you can concentrate on important mental tasks when your mind is most "awake". For creative insight into a problem, do the opposite.

如果你学会辨认和跟踪你的大脑状态，你可以在思维最“清醒”时专注于重要的脑力工作，当创造性洞察遇到难题，就要反其道而行了。

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The eastbound train, headed to New Haven from Grand Central Terminal, derailed at about 6:10 p.m. just east of the Fairfield Metro station, and hit a westbound train on the opposite track, Metro-North spokeswoman Marjorie Anders said, knocking several cars of that train off the rails.

WSJ: Train Derailment Injures Dozens

Car computers keep a record of the activities of all surrounding cars so they can quickly discard information about a car moving quickly in the opposite direction but track a car moving in the same direction around a corner and determine if it will soon be in the same lane as your own.

FORBES: Car Talk

It explained that this was "because the previous train, an engineers' on-track machine, had passed through the crossing in the opposite direction to normal".

BBC: Barriers 'held down longer' in Somerset rail crash