Why we yawn 我们为什么打哈欠？
<p>随身英语<span word="Why">Why</span> <span word="we">we</span> <span word="yawn">yawn</span> 我们为什么打哈欠？</p><p> </p><p>请注意，点开这篇文章可能会让你打哈欠！这并不是因为我们的节目太无聊或者你会被传染上哈欠，而是因为只要我们看到别人打哈欠，甚至只是想想这个行为，都可能引发我们来一个大哈欠！但这究竟是为什么呢，本集《随身英语》将会解答你的疑惑。</p><p>课文内容 <span word="Vocabulary">Vocabulary</span>: <span word="Biology">Biology</span> 词汇:生物学</p><p><span word="It">It</span>’<span word="s">s</span> <span word="a">a</span> <span word="question">question</span> <span word="that">that</span> <span word="has">has</span> <span word="puzzled">puzzled</span> <span word="scientists">scientists</span> <span word="for">for</span> <span word="a">a</span> <span word="long">long</span> <span word="time">time</span>: <span word="why">why</span> <span word="exactly">exactly</span> <span word="do">do</span> <span word="we">we</span> <span word="yawn">yawn</span>? </p><p><span word="In">In</span> <span word="a">a</span> <span word="recent">recent</span> <span word="breakthrough">breakthrough</span>, <span word="scientists">scientists</span> <span word="have">have</span> <span word="discovered">discovered</span> <span word="the">the</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="brain">brain</span> <span word="responsible">responsible</span> <span word="for">for</span> <span word="contagious">contagious</span> <span word="yawning">yawning</span>. <span word="It">It</span>’<span word="s">s</span> <span word="called">called</span> <span word="the">the</span> <span word="primary">primary</span> <span word="motor">motor</span> <span word="cortex">cortex</span>, <span word="and">and</span> <span word="controls">controls</span> <span word="movement">movement</span> <span word="in">in</span> <span word="the">the</span> <span word="body">body</span>. <span word="When">When</span> <span word="triggered">triggered</span> <span word="it">it</span> <span word="makes">makes</span> <span word="us">us</span> <span word="yawn">yawn</span>. <span word="But">But</span> <span word="we">we</span> <span word="can">can</span>’<span word="t">t</span> <span word="choose">choose</span> <span word="to">to</span> <span word="yawn">yawn</span> – <span word="it">it</span>’<span word="s">s</span> <span word="an">an</span> <span word="involuntary">involuntary</span> <span word="imitation">imitation</span> <span word="of">of</span> <span word="other">other</span> <span word="people">people</span>. <span word="You">You</span> <span word="know">know</span> <span word="how">how</span> <span word="it">it</span> <span word="goes">goes</span>: <span word="your">your</span> <span word="friend">friend</span> <span word="yawns">yawns</span>, <span word="you">you</span> <span word="yawn">yawn</span>. </p><p><span word="Knowing">Knowing</span> <span word="which">which</span> <span word="section">section</span> <span word="of">of</span> <span word="the">the</span> <span word="brain">brain</span> <span word="is">is</span> <span word="involved">involved</span> <span word="is">is</span> <span word="only">only</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="answer">answer</span>. <span word="There">There</span> <span word="is">is</span> <span word="still">still</span> <span word="a">a</span> <span word="deeper">deeper</span> <span word="question">question</span> <span word="of">of</span> ‘<span word="why">why</span>’. <span word="And">And</span> <span word="we">we</span> <span word="don">don</span>’<span word="t">t</span> <span word="only">only</span> <span word="yawn">yawn</span> <span word="when">when</span> <span word="others">others</span> <span word="do">do</span>, <span word="we">we</span> <span word="sometimes">sometimes</span> <span word="yawn">yawn</span> <span word="alone">alone</span>.</p><p><span word="So">So</span>, <span word="let">let</span>’<span word="s">s</span> <span word="start">start</span> <span word="with">with</span> <span word="the">the</span> <span word="physiological">physiological</span> <span word="theories">theories</span> <span word="behind">behind</span> <span word="yawning">yawning</span>. <span word="As">As</span> <span word="far">far</span> <span word="back">back</span> <span word="as">as</span> 400<span word="BC">BC</span>, <span word="Greek">Greek</span> <span word="physician">physician</span> <span word="Hippocrates">Hippocrates</span> <span word="speculated">speculated</span> <span word="that">that</span> <span word="yawning">yawning</span> <span word="released">released</span> <span word="harmful">harmful</span> <span word="gases">gases</span> <span word="from">from</span> <span word="the">the</span> <span word="body">body</span>, <span word="like">like</span> “<span word="steam">steam</span> <span word="escaping">escaping</span> <span word="from">from</span> <span word="a">a</span> <span word="cauldron">cauldron</span>”. <span word="His">His</span> <span word="colourful">colourful</span> <span word="theory">theory</span> <span word="is">is</span> <span word="now">now</span>, <span word="sadly">sadly</span>, <span word="discounted">discounted</span>. </p><p><span word="A">A</span> <span word="more">more</span> <span word="recent">recent</span> <span word="idea">idea</span> <span word="suggests">suggests</span> <span word="that">that</span> <span word="we">we</span> <span word="yawn">yawn</span> <span word="in">in</span> <span word="order">order</span> <span word="to">to</span> <span word="cool">cool</span> <span word="down">down</span> <span word="the">the</span> <span word="brain">brain</span>. <span word="Just">Just</span> <span word="like">like</span> <span word="a">a</span> <span word="busy">busy</span> <span word="computer">computer</span> <span word="processor">processor</span>, <span word="our">our</span> <span word="brains">brains</span> <span word="can">can</span> <span word="overheat">overheat</span>. <span word="Psychologist">Psychologist</span> <span word="Gordon">Gordon</span> <span word="Gallup">Gallup</span> <span word="from">from</span> <span word="the">the</span> <span word="University">University</span> <span word="at">at</span> <span word="Albany">Albany</span> <span word="has">has</span> <span word="argued">argued</span> <span word="that">that</span> <span word="the">the</span> <span word="act">act</span> <span word="of">of</span> <span word="yawning">yawning</span> <span word="delivers">delivers</span> <span word="a">a</span> <span word="rush">rush</span> <span word="of">of</span> <span word="oxygen">oxygen</span> <span word="to">to</span> <span word="the">the</span> <span word="brain">brain</span>, <span word="helping">helping</span> <span word="us">us</span> <span word="think">think</span> <span word="more">more</span> <span word="clearly">clearly</span>. </p>
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