"The wet bulb temperature includes the cooling effect of water evaporating from the thermometer, and so is normally much lower than the normal ("dry bulb") temperature reported in weather forecasts," Dr Matthews wrote.

马修斯博士写道：“湿球温度包括温度计的水分蒸发冷却效果，因此通常比天气预报中的正常（干球）温度低得多。”

"Once this wet bulb temperature threshold is crossed, the air is so full of water vapour that sweat no longer evaporates," he said.

他说：“一旦湿球温度超过阈值，空气中就充满了水蒸气，汗水就不再蒸发了。”

This means the human body cannot cool itself enough to survive more than a few hours.

这意味着人体不能自我降温，这种情况持续几个小时就能危及生命。

"Without the means to dissipate heat, our core temperature rises, irrespective of how much water we drink, how much shade we seek, or how much rest we take," he explained.

他解释说：“如果没有散热的方法，人体的核心温度就会上升，不管我们喝了多少水，在阴凉地方呆了多久，或者休息了多长时间。”

Some areas – which are among the most densely populated on Earth – could pass this threshold by the end of the century, according to Dr Matthews.

马修斯博士说，地球上人口最密集的一些地区的湿球温度可能会在本世纪末突破这一阈值。

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