Yawning may help you keep a cool head-literally , a new study suggests .
在一项新的研究表明,打呵欠可能有助于我们保持头脑冷静,从字面上来理解。
Many people believe that yawning gets more oxygen into the body or expels more carbon dioxide .
许多人相信,打呵欠可以让更多的氧气进入到身体中,或者排出更多的二氧化碳。
In addition to potentially solving the mystery of yawning , the study may also reveal why we have sinuses , whose existence has also stumped scientists .