A previous study in rats showed that yawning was triggered by rapid increases in brain heat and was followed by a sudden drop in temperature, he added.

他还进一步补充说，此前在鼠类身上实验的结果表明，打呵欠是由大脑温度急剧升高引起，而打呵欠后大脑温度又会骤然下降。

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The economic boom in China has consisted of rapid increases in true economic growth accompanied by -but not driven by -an increase in monetary spending.

中国的经济繁荣包括真正的经济高速增长，伴随着消费增长，但后者并非其增长的主要驱动力。

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Spain has achieved one of the most rapid increases in wealth in the euro zone, but it remains stuck with an unbalanced economy and low domestic productivity.

虽然西班牙如今已是欧洲经济增长势头最为迅猛的国家，却还是被经济的不平衡和生产力的落后所困扰。

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Just as with product prices, rapid increases in asset prices can distort the allocation of resources.

ECONOMIST: On the trail of the mutant inflation monster

This demographic challenge should come as no real surprise, even allowing for unexpectedly rapid increases in longevity.

ECONOMIST: Pensions

Rapid increases in the availability and power of information technologies are changing the way the world does business and the infrastructure by which it operates.

FORBES: Making a difference through mentorship