In the U.S., which is probably one of the most restrictive of all mobile markets, Google has managed to sign up two of the top four wireless operators, Sprint Nextel and T-Mobile USA.

在美国，这个最受限制的市场上，Google已经设法使最大的四家无线运营商中的两家——Sprint Nextel和t - Mobile美国加入进来。

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And in each of the four successful cases they were able take the patient off immunosuppressant drugs within 8-14 months, with no sign of rejection.

在成功的四例中的每一例，他们都能够使病人在8 - 14个月内不使用免疫抑制药物而不发生排异现象。

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The problem has persisted for about three or four weeks now, with no sign of abatement.

这个问题已经持续大约三到四周，且尚无任何缓和迹象。

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The 12 patients who took Vertex's drug in combination with interferon and ribavirin showed no sign of the virus after four weeks of treatment.

FORBES: Magazine Article

The four-week moving average of claims fell to its lowest level in nearly four years, a sign that employers are slowing the pace of layoffs.

WSJ: Blue Chips Hold, End Higher

The splash of four IPOs nearly at once could be a sign the market is hungry for new shares to buy.

WSJ: Fender, Kayak, Others Seek to Break IPO Drought