Driving for more than two hours a day negatively affects IQ levels, scientists have warned.

科学家警告称，每天驾驶时间超过2小时会对智商产生消极影响。

In what might come as unwelcome news for middle-aged commuters, a recent study found that long periods behind the wheel could speed up the effects of age on the brain.

最近的一项研究发现，长期驾车会加速大脑老化，这对中年通勤族而言并非好消息。

The researchers said that the results could be explained by the fact that the mind is less active on long car journeys.

研究人员表示，产生这一结果的原因可能是在长时间驾驶过程中，大脑不如往常活跃。

The mammoth project saw more than half a million Britons aged 37-73 studied over a period of five years. Out of these some 93,000 of them drove more than two or three hours a day.

这个规模庞大的研究项目在五年间观察了超过50万名37岁至73岁的英国人。他们中有约93000人每天驾驶时间超过两三个小时。

Researchers found that not only did this proportion of subjects typically have lower brainpower to begin with but their IQ score declined more rapidly over the course of the study than those who did little or no driving.

研究人员发现，通常这部分研究对象不仅在一开始智商水平就偏低，而且研究期间他们的智商下降得比很少开车或不开车的研究对象快。

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