The same effect was found among those who held a cool pack to their forehead, whereas those who held a warm or room-temperature pack yawned while watching the video.
将冰袋敷在前额上也能起到类似的效果，而在观看视频时用暖水袋或室温水袋敷在额头上的人却无法避免打呵欠。
The same effect was found among those who held a cool pack to their forehead, whereas those who held a warm or room-temperature pack yawned while watching the video.
将冰袋敷在前额上也能起到类似的效果，而在观看视频时用暖水袋或室温水袋敷在额头上的人却无法避免打呵欠。
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