神秘的死亡之谷风帆石
<p>你可曾见过会走路的石头?美国加州死亡谷有一种奇特的现象：石头会在荒滩沙漠上神秘地“自行移动”，并在地面上留下行走的痕迹。这一神秘现象在科学界引发的讨论已逾数十年。它们又是怎么移动的呢?真的是超自然力量的驱使吗?</p><p><span word="A">A</span> <span word="baffling">baffling</span> <span word="phenomenon">phenomenon</span> <span word="of">of</span> <span word="nature">nature</span> <span word="or">or</span> <span word="a">a</span> <span word="paranormal">paranormal</span> <span word="display">display</span> <span word="of">of</span> <span word="supernatural">supernatural</span> <span word="existence">existence</span> <span word="or">or</span> <span word="is">is</span> <span word="it">it</span> <span word="an">an</span> <span word="alien">alien</span> <span word="intervention">intervention</span>? <span word="Questions">Questions</span> <span word="still">still</span> <span word="remain">remain</span> <span word="unanswered">unanswered</span> <span word="while">while</span> <span word="experts">experts</span> <span word="are">are</span> <span word="still">still</span> <span word="nailing">nailing</span> <span word="down">down</span> <span word="on">on</span> <span word="what">what</span> <span word="could">could</span> <span word="be">be</span> <span word="the">the</span> <span word="accurate">accurate</span> <span word="reason">reason</span> <span word="behind">behind</span> <span word="stones">stones</span> <span word="of">of</span> <span word="Death">Death</span> <span word="Valley">Valley</span> <span word="that">that</span> <span word="slide">slide</span> <span word="by">by</span> <span word="themselves">themselves</span>, <span word="without">without</span> <span word="the">the</span> <span word="interference">interference</span> <span word="of">of</span> <span word="humans">humans</span> <span word="or">or</span> <span word="animals">animals</span>. <span word="In">In</span> <span word="the">the</span> <span word="southwest">southwest</span> <span word="of">of</span> <span word="the">the</span> <span word="United">United</span> <span word="States">States</span> <span word="of">of</span> <span word="America">America</span>, <span word="lies">lies</span> <span word="this">this</span> <span word="mysterious">mysterious</span> <span word="valley">valley</span>—<span word="popular">popular</span> <span word="as">as</span> <span word="the">the</span> <span word="hottest">hottest</span> <span word="and">and</span> <span word="driest">driest</span> <span word="location">location</span> <span word="in">in</span> <span word="North">North</span> <span word="America">America</span>. <span word="This">This</span> <span word="lowest">lowest</span> <span word="lying">lying</span> <span word="point">point</span> <span word="of">of</span> <span word="the">the</span> <span word="continent">continent</span> <span word="is">is</span> <span word="a">a</span> <span word="deserted">deserted</span> <span word="floor">floor</span> <span word="located">located</span> <span word="in">in</span> <span word="the">the</span> <span word="Inyo">Inyo</span> <span word="Country">Country</span> <span word="by">by</span> <span word="the">the</span> <span word="border">border</span> <span word="of">of</span> <span word="California">California</span> <span word="and">and</span> <span word="Nevada">Nevada</span>, <span word="and">and</span> <span word="consists">consists</span> <span word="of">of</span> <span word="a">a</span> <span word="dry">dry</span> <span word="lakebed">lakebed</span> <span word="named">named</span> “<span word="Racetrack">Racetrack</span> <span word="Playa">Playa</span>” <span word="which">which</span> <span word="is">is</span> <span word="proved">proved</span> <span word="to">to</span> <span word="have">have</span> <span word="the">the</span> <span word="motion">motion</span> <span word="of">of</span> <span word="rocks">rocks</span> <span word="every">every</span> <span word="two">two</span> <span word="or">or</span> <span word="three">three</span> <span word="years">years</span>.</p><p><span word="What">What</span> <span word="are">are</span> <span word="Sailing">Sailing</span> <span word="Stones">Stones</span>?</p><p>“<span word="Sailing">Sailing</span> <span word="Stones">Stones</span>” <span word="of">of</span> <span word="Death">Death</span> <span word="Valley">Valley</span>—<span word="named">named</span> <span word="from">from</span> <span word="their">their</span> <span word="distinctive">distinctive</span> <span word="and">and</span> <span word="mysterious">mysterious</span> <span word="feature">feature</span> <span word="are">are</span> <span word="in">in</span> <span word="a">a</span> <span word="count">count</span> <span word="of">of</span> <span word="hundreds">hundreds</span> <span word="scattered">scattered</span> <span word="allover">allover</span> <span word="the">the</span> <span word="Racetrack">Racetrack</span> <span word="Playa">Playa</span> <span word="from">from</span> <span word="the">the</span> <span word="size">size</span> <span word="of">of</span> <span word="a">a</span> <span word="pebble">pebble</span> <span word="to">to</span> <span word="as">as</span> <span word="large">large</span> <span word="as">as</span> <span word="huge">huge</span> <span word="boulders">boulders</span>. <span word="The">The</span> <span word="playa">playa</span> <span word="which">which</span> <span word="is">is</span> <span word="nothing">nothing</span> <span word="but">but</span> <span word="a">a</span> <span word="flat">flat</span> <span word="bed">bed</span> <span word="of">of</span> <span word="scorched">scorched</span> <span word="mud">mud</span> <span word="observes">observes</span> <span word="the">the</span> <span word="sailing">sailing</span> <span word="of">of</span> <span word="such">such</span> <span word="stones">stones</span> <span word="on">on</span> <span word="its">its</span> <span word="broken">broken</span> <span word="surface">surface</span> <span word="of">of</span> <span word="flat">flat</span> <span word="octagons">octagons</span> <span word="and">and</span> <span word="pentagons">pentagons</span>. <span word="While">While</span> <span word="the">the</span> <span word="stones">stones</span> <span word="having">having</span> <span word="rough">rough</span> <span word="bottoms">bottoms</span> <span word="tend">tend</span> <span word="to">to</span> <span word="form">form</span> <span word="smooth">smooth</span> <span word="straight">straight</span> <span word="tracks">tracks</span>, <span word="stones">stones</span> <span word="with">with</span> <span word="smoother">smoother</span> <span word="bottom">bottom</span> <span word="are">are</span> <span word="found">found</span> <span word="wandering">wandering</span> <span word="in">in</span> <span word="an">an</span> <span word="unorganized">unorganized</span> <span word="pattern">pattern</span>. <span word="Stones">Stones</span> <span word="also">also</span> <span word="tend">tend</span> <span word="to">to</span> <span word="turn">turn</span> <span word="over">over</span> <span word="during">during</span> <span word="this">this</span> <span word="process">process</span> <span word="leading">leading</span> <span word="all">all</span> <span word="the">the</span> <span word="way">way</span> <span word="to">to</span> <span word="another">another</span> <span word="track">track</span>.</p>
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