For instance, yawning should not occur when ambient temperatures exceed bodytemperature, as taking a deep inhalation of warm air would be counterproductive.
举个例子,呵欠在环境温度超过体温时不大可能发生,因为这时候深吸一口热空气只能帮倒忙。
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That is to say, they sleep during the winter, but their sleep is not deep and their bodytemperature does not drop, as they are warm blooded animals.