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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Looking ahead, prospects are for a sharp reduction in export growth.

前景是出口增长的巨额下降。

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That has led to a sharp reduction in the US trade deficit, and meant that the rebalancing process was half complete.

这也导致美国贸易逆差急剧下降，也就意味着再平衡过程完成了一半。

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It's not only Scotland that's seen a sharp reduction in the number of listed companies with headquarters.

BBC: Is London good or bad for Scotland?

Good behavior rules and jail overcrowding guidelines add up to a sharp reduction in actual time served for county inmates, Whitmore said.

CNN: Bobby Brown goes to jail

In a non-negotiable six minutes, long answers equal dead time and a sharp reduction in the amount of questions you can ask.

BBC: In a bedroom with Madonna