Hereditary sleep disorder expert Louis Ptacek of the University of California in San Francisco said the findings could help us understand "how our sophisticated biological clock is being altered".

旧金山加利福尼亚大学的睡眠遗传学家Louis Ptacek表示，该结果可帮助我们理解“精确的生物钟是如何被修改的”。

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In return,he had to promise that the mail would travel from Saint Louis,Missouri, to San Francisco,California, in twenty-five days or less.

VOA: special.2010.04.26

So the stagecoach would travel south from Saint Louis to El Paso,Texas, then over to southern California, then north to San Francisco.

VOA: special.2010.04.26

The cost would be one hundred fifty dollars to travel from Saint Louis to San Francisco.

VOA: special.2010.04.26

It's a busy Sunday at the butcher's stall at the (foreign spoken) or the flower market, in the San Louis district of Caracas.

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Louis than in San Francisco or Boston.

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Louis, Phoenix, San Diego, Las Vegas, and popular college towns across the country.

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