研究人员称“反向驾驶浪潮”能够解释为何交通阻塞有时候似乎好像无缘无故的出现。
Researchers say that a "backward traveling wave" can explain why traffic jams sometimes appear seemingly out of nowhere. Cynthia Graber reports.
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这种方式可以交通，以及反向链接。
This way you can traffic as well as backlinks.
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