Kevin Balke, a research engineer at the Texas A&M University Transportation Institute, says that while smart lights can be particularly beneficial for some cities, others are so jammed that only a sharp reduction in the number of cars on the road will make a meaningful difference.

德克萨斯农工大学交通研究所的研究工程师凯文·鲍克说，虽然智能交通灯对一些城市特别有帮助，但有些城市太拥挤了，只有大幅减少道路上的汽车数量才能有效改变拥堵的局面。

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The voice had come from a man who, in the dim light, appeared to be thin, balding at the temples, with a sharp face furrowed by shifting wrinkles.

这个声音来自坐在昏暗的灯光里的一个男人，看上去瘦瘦的，太阳穴部位快变秃了，消瘦的面孔带着多变的皱纹。

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At 81, Alberta Sabin's mind is not as sharp as it used to be, and she knows it.

81岁的亚伯达·萨宾的头脑不如过去那么灵敏了，她自己也知道这件事。

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"There could be a sharp correction at some point, but no one has any idea about the extent or magnitude, " he said.

BBC: Pound hits four-year low

It is never comfortable to be at the sharp end of the political process.

ECONOMIST: Cabins in the wilderness: The market growls | The

If European technocrats do have more of a role in micro-managing eurozone member states' budgets there would inevitably be pressure for the citizens at the sharp end to have some means of holding the decision makers to account.

BBC: Northern Ireland