原来鳄鱼能跑步，跑起来还挺萌的
<p><span word="Even">Even</span> <span word="on">on</span> <span word="land">land</span>, <span word="crocodiles">crocodiles</span> <span word="are">are</span> <span word="no">no</span> <span word="fish">fish</span> <span word="out">out</span> <span word="of">of</span> <span word="water">water</span>. <span word="While">While</span> <span word="these">these</span> <span word="reptiles">reptiles</span> <span word="might">might</span> <span word="look">look</span> <span word="lazy">lazy</span> <span word="and">and</span> <span word="slow">slow</span> <span word="sunning">sunning</span> <span word="on">on</span> <span word="the">the</span> <span word="bank">bank</span>, <span word="they">they</span> <span word="can">can</span> <span word="easily">easily</span> <span word="pick">pick</span> <span word="up">up</span> <span word="speed">speed</span> <span word="when">when</span> <span word="necessary">necessary</span>, <span word="and">and</span> <span word="a">a</span> <span word="scary">scary</span> <span word="number">number</span> <span word="can">can</span> <span word="gallop">gallop</span> <span word="or">or</span> <span word="bound">bound</span> <span word="like">like</span> <span word="a">a</span> <span word="horse">horse</span> <span word="or">or</span> <span word="a">a</span> <span word="dog">dog</span>.</p><p>即使是在陆地上，鳄鱼也不是离了水的鱼。虽然这些爬行动物在河岸上晒太阳时看起来可能很懒、行动很迟缓，但必要时，它们可以轻易加速。很多鳄鱼还可以像马或狗一样疾驰或弹跳。</p><p><span word="Bounding">Bounding</span> <span word="is">is</span> <span word="when">when</span> <span word="an">an</span> <span word="animal">animal</span>'<span word="s">s</span> <span word="forelimbs">forelimbs</span> <span word="hit">hit</span> <span word="the">the</span> <span word="ground">ground</span> <span word="at">at</span> <span word="the">the</span> <span word="same">same</span> <span word="time">time</span>, <span word="with">with</span> <span word="the">the</span> <span word="back">back</span> <span word="legs">legs</span> <span word="pushing">pushing</span> <span word="off">off</span> <span word="soon">soon</span> <span word="after">after</span>; <span word="meanwhile">meanwhile</span>, <span word="a">a</span> <span word="gallop">gallop</span> <span word="is">is</span> <span word="a">a</span> <span word="four">four</span>-<span word="beat">beat</span> <span word="sequence">sequence</span> <span word="whereby">whereby</span> <span word="the">the</span> <span word="fore">fore</span> <span word="and">and</span> <span word="hindlimbs">hindlimbs</span> <span word="take">take</span> <span word="turns">turns</span> <span word="landing">landing</span>.</p><p>弹跳指的是动物的两条前肢同时触地，后肢紧接着蹬起。而疾驰是四节拍的连续动作，前肢和后肢轮流着地。</p><p><span word="Freshwater">Freshwater</span> <span word="crocodiles">crocodiles</span> <span word="from">from</span> <span word="Australia">Australia</span> (<span word="Crocodylus">Crocodylus</span> <span word="johnstoni">johnstoni</span>) <span word="were">were</span> <span word="historically">historically</span> <span word="thought">thought</span> <span word="to">to</span> <span word="be">be</span> <span word="the">the</span> <span word="only">only</span> <span word="species">species</span> <span word="capable">capable</span> <span word="of">of</span> <span word="doing">doing</span> <span word="both">both</span>. <span word="But">But</span> <span word="that">that</span>'<span word="s">s</span> <span word="not">not</span> <span word="actually">actually</span> <span word="true">true</span>. <span word="Not">Not</span> <span word="even">even</span> <span word="close">close</span>.</p><p>历史上认为澳洲淡水鳄（<span word="Crocodylus">Crocodylus</span> <span word="johnstoni">johnstoni</span>）是唯一能做到这两个动作的物种。但那不是真的。一点都不对。</p><p><span word="It">It</span> <span word="turns">turns</span> <span word="out">out</span> <span word="even">even</span> <span word="scientists">scientists</span> <span word="have">have</span> <span word="underestimated">underestimated</span> <span word="these">these</span> <span word="creatures">creatures</span>. <span word="Past">Past</span> <span word="research">research</span> <span word="suggested">suggested</span> <span word="only">only</span> <span word="a">a</span> <span word="handful">handful</span> <span word="of">of</span> <span word="croc">croc</span> <span word="species">species</span> <span word="were">were</span> <span word="able">able</span> <span word="to">to</span> <span word="gallop">gallop</span>, <span word="but">but</span> <span word="a">a</span> <span word="new">new</span> <span word="study">study</span> <span word="now">now</span> <span word="adds">adds</span> <span word="five">five</span> <span word="more">more</span> <span word="to">to</span> <span word="the">the</span> <span word="mix">mix</span>, <span word="suggesting">suggesting</span> <span word="it">it</span>'<span word="s">s</span> <span word="a">a</span> <span word="whole">whole</span> <span word="lot">lot</span> <span word="more">more</span> <span word="common">common</span> <span word="than">than</span> <span word="we">we</span> <span word="ever">ever</span> <span word="thought">thought</span>.</p><p>甚至连科学家都低估了这些物种。过去的研究表明，只有少数几个鳄鱼品种能够疾驰，但是一项新的研究把五个新品种加了进去。这表明疾驰比我们想象的更加常见。</p>
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