关于接吻 你不知道的15件事
<p>1.<span word="Only">Only</span> <span word="you">you</span>: <span word="Human">Human</span> <span word="lips">lips</span> <span word="are">are</span> <span word="different">different</span> <span word="from">from</span> <span word="those">those</span> <span word="of">of</span> <span word="all">all</span> <span word="other">other</span> <span word="animals">animals</span> <span word="because">because</span> <span word="they">they</span> <span word="are">are</span> <span word="everted">everted</span>, <span word="meaning">meaning</span> <span word="that">that</span> <span word="they">they</span> <span word="purse">purse</span> <span word="outward">outward</span>.</p><p>人类的嘴唇是外翻的，这一点和所有其他动物都不一样。</p><p>2.<span word="But">But</span> <span word="we">we</span> <span word="are">are</span> <span word="not">not</span> <span word="the">the</span> <span word="only">only</span> <span word="species">species</span> <span word="to">to</span> <span word="engage">engage</span> <span word="in">in</span> <span word="kissing">kissing</span>-<span word="like">like</span> <span word="behaviors">behaviors</span>. <span word="Great">Great</span> <span word="apes">apes</span> <span word="press">press</span> <span word="their">their</span> <span word="lips">lips</span> <span word="together">together</span> <span word="to">to</span> <span word="express">express</span> <span word="excitement">excitement</span>, <span word="affection">affection</span>, <span word="or">or</span> <span word="reconciliation">reconciliation</span>.</p><p>但人类并不是唯一一个会做出“接吻”行为的物种。类人猿（包括大猩猩、黑猩猩、长臂猿等）在表达兴奋、喜爱或和解的时候也会将彼此的嘴唇贴在一起。</p><p>3.<span word="Scientists">Scientists</span> <span word="are">are</span> <span word="not">not</span> <span word="sure">sure</span> <span word="why">why</span> <span word="humans">humans</span> <span word="kiss">kiss</span>, <span word="but">but</span> <span word="some">some</span> <span word="think">think</span> <span word="the">the</span> <span word="answer">answer</span> <span word="lies">lies</span> <span word="in">in</span> <span word="early">early</span> <span word="feeding">feeding</span> <span word="experiences">experiences</span>. <span word="Through">Through</span> <span word="nursing">nursing</span> <span word="and">and</span> (<span word="in">in</span> <span word="some">some</span> <span word="cultures">cultures</span>) <span word="receiving">receiving</span> <span word="pre">pre</span>-<span word="chewed">chewed</span> <span word="food">food</span> <span word="from">from</span> <span word="a">a</span> <span word="parent">parent</span>'<span word="s">s</span> <span word="mouth">mouth</span>, <span word="infants">infants</span> <span word="may">may</span> <span word="learn">learn</span> <span word="to">to</span> <span word="associate">associate</span> <span word="lip">lip</span> <span word="pressure">pressure</span> <span word="with">with</span> <span word="a">a</span> <span word="loving">loving</span> <span word="act">act</span>.</p><p>科学家们并不确切知道人类为什么要接吻，但一些人认为接吻行为和早期哺乳经历有关。通过哺乳——在一些文化中母亲还会将嚼碎的食物嘴对嘴喂给婴儿——婴儿可能学会了将嘴唇接触和表达爱意联系起来。</p><p>4.<span word="Another">Another</span> <span word="possibility">possibility</span>: <span word="Smelling">Smelling</span> <span word="a">a</span> <span word="loved">loved</span> <span word="one">one</span>'<span word="s">s</span> <span word="cheek">cheek</span> <span word="has">has</span> <span word="long">long</span> <span word="served">served</span> <span word="as">as</span> <span word="a">a</span> <span word="means">means</span> <span word="of">of</span> <span word="recognition">recognition</span> <span word="in">in</span> <span word="cultures">cultures</span> <span word="around">around</span> <span word="the">the</span> <span word="world">world</span>, <span word="from">from</span> <span word="New">New</span> <span word="Zealand">Zealand</span> <span word="to">to</span> <span word="Alaska">Alaska</span>. <span word="Over">Over</span> <span word="time">time</span>, <span word="a">a</span> <span word="brush">brush</span> <span word="of">of</span> <span word="the">the</span> <span word="lips">lips</span> <span word="may">may</span> <span word="have">have</span> <span word="become">become</span> <span word="a">a</span> <span word="traditional">traditional</span> <span word="accompaniment">accompaniment</span>.</p><p>另一种可能是：在世界各地——从新西兰到阿拉斯加——嗅闻所爱之人的脸颊一直都是表达认可的一种方式，久而久之，可能就伴随着发展出了碰触嘴唇这样一种传统礼仪。</p>
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