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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Cell phones are a danger on the road in more ways than one.

手机在路上有多种多样的危险。

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A separate study presented at the heart conference found no danger to heart devices from cell phones equipped with Bluetooth wireless technology.

心脏会议上公布的单独研究发现蓝牙无线技术手机不对心脏设备构成威胁。

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The CTIA, the wireless industry trade group, noted that no research has found cell phones to be a danger to health.

CNN: Cell phone exposure increases brain cell activity