Scientists are mostly stumped as to how the radio frequency waves emitted by cellphones, which lack the punch to break chemical bonds or disrupt DNA, might cause cancer.

科学家们主要搞不懂的是，手机所释放的无线电波，连打断化学键或扰乱dna的冲击力都没有，又怎么可能导致癌症呢？

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You may need to alter your walk break frequency to adjust for breaks in your training, course conditions, and weather conditions.

在训练过程中，你也许需要多次调整步行安排，随着路程、天气的变化而变。

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Others worried about the hyperactivity of high-frequency traders have suggested charging them for each trade they break.

那些担心高频交易员过度活跃的人建议对他们所打断的每项交易收费。

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Others worried about the hyperactivity of high-frequency traders have suggested charging them for each trade they break, although that would not necessarily improve liquidity and is an idea that is unlikely to be pursued.

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In Las Vegas casinos, for instance, hourly breaks are often built into shifts, because health research shows that a higher frequency of short breaks can be more beneficial than just one long break.

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That contrasts with the average of 250 shares on exchanges where institutions break big order into slivers to avoid moving the markets or getting played by high frequency traders.

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