Sea otters ahead of dolphins in using tools 海獭学会使用工具的时间早于海豚
<p>媒体英语 <span word="Sea">Sea</span> <span word="otters">otters</span> <span word="ahead">ahead</span> <span word="of">of</span> <span word="dolphins">dolphins</span> <span word="in">in</span> <span word="using">using</span> <span word="tools">tools</span> 海獭学会使用工具的时间早于海豚 </p><p><span word="Play">Play</span> <span word="audio">audio</span> <span word="file">file</span> 文字稿 人们经常能看到海獭仰面浮在水上用石头敲开贝壳类动物进食的场景。科学家说，海獭可能很久以前就已经学会把石头当作工具使用了，而且似乎比其它的海洋哺乳动物都要早。一项遗传研究分析了在加利福尼亚海岸附近生活的100 多只海獭，结果表明，在几百万年前海獭的祖先就已经开始表现出这类行为了。请听 <span word="Helen">Helen</span> <span word="Briggs">Briggs</span> 的报道。</p><p><span word="Sea">Sea</span> <span word="otters">otters</span> <span word="are">are</span> <span word="often">often</span> <span word="seen">seen</span> <span word="floating">floating</span> <span word="on">on</span> <span word="their">their</span> <span word="backs">backs</span> <span word="hammering">hammering</span> <span word="at">at</span> <span word="clams">clams</span> <span word="with">with</span> <span word="rocks">rocks</span>. <span word="They">They</span> <span word="break">break</span> <span word="open">open</span> <span word="the">the</span> <span word="shells">shells</span> <span word="to">to</span> <span word="reveal">reveal</span> <span word="a">a</span> <span word="tasty">tasty</span> <span word="meal">meal</span> <span word="inside">inside</span>.</p><p><span word="New">New</span> <span word="research">research</span> <span word="suggests">suggests</span>, <span word="even">even</span> <span word="the">the</span> <span word="ancestors">ancestors</span> <span word="of">of</span> <span word="sea">sea</span> <span word="otters">otters</span> <span word="living">living</span> <span word="millions">millions</span> <span word="of">of</span> <span word="years">years</span> <span word="ago">ago</span> <span word="knew">knew</span> <span word="how">how</span> <span word="to">to</span> <span word="do">do</span> <span word="this">this</span>. <span word="That">That</span>'<span word="s">s</span> <span word="according">according</span> <span word="to">to</span> <span word="a">a</span> <span word="genetic">genetic</span> <span word="study">study</span> <span word="of">of</span> <span word="otters">otters</span> <span word="living">living</span> <span word="off">off</span> <span word="the">the</span> <span word="Californian">Californian</span> <span word="coast">coast</span>.</p><p><span word="They">They</span> <span word="are">are</span> <span word="not">not</span> <span word="the">the</span> <span word="only">only</span> <span word="marine">marine</span> <span word="mammals">mammals</span> <span word="to">to</span> <span word="use">use</span> <span word="tools">tools</span>. <span word="Dolphins">Dolphins</span> <span word="in">in</span> <span word="Australia">Australia</span> <span word="have">have</span> <span word="been">been</span> <span word="seen">seen</span> <span word="to">to</span> <span word="use">use</span> <span word="sponges">sponges</span> <span word="to">to</span> <span word="protect">protect</span> <span word="their">their</span> <span word="noses">noses</span> <span word="when">when</span> <span word="scouting">scouting</span> <span word="for">for</span> <span word="fish">fish</span> <span word="on">on</span> <span word="the">the</span> <span word="sea">sea</span> <span word="floor">floor</span>. <span word="But">But</span> <span word="in">in</span> <span word="dolphins">dolphins</span>, <span word="this">this</span> <span word="seems">seems</span> <span word="to">to</span> <span word="be">be</span> <span word="a">a</span> <span word="relatively">relatively</span> <span word="new">new</span> <span word="invention">invention</span>, <span word="happening">happening</span> <span word="less">less</span> <span word="than">than</span> 200 <span word="years">years</span> <span word="ago">ago</span>. <span word="Evidence">Evidence</span>, <span word="say">say</span> <span word="the">the</span> <span word="scientists">scientists</span>, <span word="that">that</span> <span word="sea">sea</span> <span word="otters">otters</span> <span word="are">are</span> <span word="very">very</span> <span word="smart">smart</span> <span word="and">and</span> <span word="have">have</span> <span word="a">a</span> <span word="natural">natural</span> <span word="ability">ability</span> <span word="to">to</span> <span word="use">use</span> <span word="tools">tools</span>.</p><p>词汇表 <span word="sea">sea</span> <span word="otters">otters</span> 海獭</p><p><span word="on">on</span> <span word="their">their</span> <span word="backs">backs</span> 仰面躺着</p><p><span word="hammering">hammering</span> 用力锤打、敲击</p><p><span word="genetic">genetic</span> <span word="study">study</span> 遗传研究</p>
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