For instance, yawning should not occur when ambient temperatures exceed body temperature, 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。
That is to say, they sleep during the winter, but their sleep is not deep and their body temperature does not drop, as they are warm blooded animals.
就是说，每到冬天它就睡觉，不过他们睡得不那么沉，因为他们属温血运动，所以体温不下降。
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