Another flaw of the tiredness theory is that yawning does not raise alertness or physiological activity, as the theory would predict.

疲劳理论的另一个缺陷是，打哈欠并不能像该理论所预测的那样，提高警觉性或生理活跃度。

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Another flaw of the tiredness theory is that yawning does not raise alertness or physiological activity, as the theory would predict.

疲劳理论的另一个缺陷是，打哈欠并不能像该理论所预测的那样，提高警觉性或生理活跃度。

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