A recent study said that 40% of American teens claim to have been in a car when the driver used a cell phone in a way that put people in danger.

最近的一项研究表明，40%的美国青少年称他们遇到过驾驶时玩手机的司机，这让人处于危险之中。

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Should controls include only those who never used a cell phone and exclude those who'd used one only infrequently?

这一组是不是应该只研究从来不用手机的人，而把极少用手机的人排除在外呢？

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It showed participants in the study who used a cell phone for 10 years or more had doubled the rate of brain glioma, a type of tumor.

此研究中使用手机10年或更长的参试者中脑神经胶质瘤发病率是普通发病率的2倍。

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It showed participants in the study who used a cell phone for 10 years or more had doubled the rate of brain glioma, a type of tumor.

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Furthermore, no information was available on how many minutes per day a subscriber used the cell phone.

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Instead he used his cell phone to call a colleague at another office building eight miles away.

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