🌏Article
Even though we yawn almost every day, scientists don't really know why we do it.
One theory suggests that people yawn when they need more oxygen in their blood. Another says that the body may yawn to wake itself up because yawning stretches the lungs and increases blood flow to the brain. However, many researchers now believe that yawning may cool the brain when it gets too hot.
A 2007 study asked participants to watch a video of other people yawning while holding a towel to their forehead that was either 46 degrees Celsius, 4 degrees Celsius or room temperature. Researchers recorded nine yawns each from the groups holding the warm and room temperature towel, but only one from the group with the cold towel.
Another study from 2014 looked at whether people in Austria yawned more in summer or winter. Participants were asked to look through pictures of people yawning before taking a survey to say how often they yawned while doing so. The researchers found that 18% of participants yawned in winter, while in summer, almost 42% yawned.

🌏Summary
科學家其實不確定我們每天都會打哈欠的原因是什麼。有理論指出，人們的血液需要更多氧氣的時候，我們就會打哈欠。也有說法指出身體可能透過打哈欠來使之甦醒，因為打哈欠讓肺部得以伸展，進而 讓血液流過大腦。不過許多研究人員現在相信在大腦太熱時，打哈欠可能會幫大腦降溫。
2007 年一項研究要求參與者觀看一段其他人打哈欠的影片，一邊拿著毛巾靠在額頭上，這些毛巾的溫度可能是攝氏 46 度、4 度或是常溫。其中，拿著冷毛巾那一組打了最少的哈欠。2014 年另一項研究觀察奧地利人是在夏天還是冬天打哈欠比較多。結果發現18%參與者在冬天打哈欠，而在夏天打哈欠的比例則將近42%。

🌏Words & Phrases

• theory理論, 學說
• suggest建議, 提議
• stretch伸長, 伸展

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