斑马条纹到底有何用？
<p><span word="How">How</span> <span word="did">did</span> <span word="zebras">zebras</span> <span word="get">get</span> <span word="their">their</span> <span word="stripes">stripes</span>? <span word="It">It</span>'<span word="s">s</span> <span word="hard">hard</span> <span word="to">to</span> <span word="get">get</span> <span word="a">a</span> <span word="black">black</span>-<span word="and">and</span>-<span word="white">white</span> <span word="answer">answer</span>.</p><p>斑马身上的条纹是如何形成的？我们很难得到确切的答案。</p><p><span word="Some">Some</span> <span word="scientists">scientists</span> <span word="say">say</span> <span word="the">the</span> <span word="stripes">stripes</span> <span word="are">are</span> <span word="a">a</span> <span word="form">form</span> <span word="of">of</span> <span word="camouflage">camouflage</span> <span word="that">that</span> <span word="protects">protects</span> <span word="zebras">zebras</span> <span word="from">from</span> <span word="hungry">hungry</span> <span word="lions">lions</span>. <span word="Others">Others</span> <span word="say">say</span> <span word="they">they</span>'<span word="re">re</span> <span word="key">key</span> <span word="to">to</span> <span word="zebra">zebra</span> <span word="mating">mating</span> <span word="rituals">rituals</span>. <span word="Just">Just</span> <span word="last">last</span> <span word="year">year</span>, <span word="researchers">researchers</span> <span word="published">published</span> <span word="research">research</span> <span word="suggesting">suggesting</span> <span word="that">that</span> <span word="the">the</span> <span word="stripes">stripes</span> <span word="repel">repel</span> <span word="biting">biting</span> <span word="flies">flies</span>, <span word="thus">thus</span> <span word="protecting">protecting</span> <span word="the">the</span> <span word="animals">animals</span> <span word="from">from</span> <span word="diseases">diseases</span> <span word="flies">flies</span> <span word="sometimes">sometimes</span> <span word="carry">carry</span>.</p><p>有些科学家认为，条纹是一种伪装的形式，保护斑马免落狮口。另一些科学家则认为，条纹在斑马的求偶仪式中起到关键作用。2017年，有研究人员发表研究称，条纹能够赶走苍蝇，保护斑马远离苍蝇经常传播的疾病。</p><p><span word="But">But</span> <span word="a">a</span> <span word="peculiar">peculiar</span> <span word="new">new</span> <span word="study">study</span> <span word="offers">offers</span> <span word="yet">yet</span> <span word="another">another</span> <span word="possible">possible</span> <span word="explanation">explanation</span>: <span word="the">the</span> <span word="stripes">stripes</span> <span word="help">help</span> <span word="the">the</span> <span word="zebras">zebras</span> <span word="stay">stay</span> <span word="cool">cool</span> <span word="in">in</span> <span word="their">their</span> <span word="sometimes">sometimes</span> <span word="sweltering">sweltering</span> <span word="habitats">habitats</span>.</p><p>一项特殊新研究提供了另一种可能的解释：斑马的栖息地有时会变得闷热难耐，条纹能助它们保持凉爽。</p>
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