揭秘：裹在香蕉上的那一根根韧丝有什么用？
<p>剥香蕉的时候，你有没有为里面的韧丝烦恼过？直接扯掉还是吃了？有没有想过香蕉为什么要长这些韧丝呢？美国学者表示，这些韧丝是为了传输营养物质而存在，完全可以食用，而且也同样富含营养。</p><p><span word="Bananas">Bananas</span> <span word="are">are</span> <span word="a">a</span> <span word="wonderful">wonderful</span> <span word="source">source</span> <span word="of">of</span> <span word="potassium">potassium</span> <span word="and">and</span> <span word="are">are</span> <span word="the">the</span> <span word="perfect">perfect</span> <span word="on">on</span>-<span word="the">the</span>-<span word="go">go</span> <span word="snack">snack</span>.</p><p>香蕉是钾元素的绝佳<span word="The">The</span> <span word="only">only</span> <span word="downside">downside</span> <span word="to">to</span> <span word="the">the</span> <span word="fruit">fruit</span> <span word="are">are</span> <span word="those">those</span> <span word="irritating">irritating</span> <span word="leathery">leathery</span> <span word="strands">strands</span> - <span word="which">which</span> <span word="are">are</span> <span word="actually">actually</span> <span word="called">called</span> '<span word="phloem">phloem</span> <span word="bundles">bundles</span>' - <span word="that">that</span> <span word="you">you</span> <span word="get">get</span> <span word="when">when</span> <span word="you">you</span> <span word="peel">peel</span> <span word="back">back</span> <span word="a">a</span> <span word="banana">banana</span> <span word="skin">skin</span>.</p><p>唯一的缺点是剥开香蕉皮时让人厌烦的韧丝，其实这是“韧皮束”。</p><p><span word="But">But</span> <span word="while">while</span> <span word="those">those</span> <span word="stringy">stringy</span> <span word="bits">bits</span> <span word="may">may</span> <span word="not">not</span> <span word="be">be</span> <span word="the">the</span> <span word="most">most</span> <span word="palatable">palatable</span>, <span word="they">they</span> <span word="are">are</span> <span word="in">in</span> <span word="fact">fact</span> <span word="very">very</span> <span word="important">important</span> - <span word="and">and</span> <span word="we">we</span> <span word="wouldn">wouldn</span>'<span word="t">t</span> <span word="be">be</span> <span word="able">able</span> <span word="to">to</span> <span word="eat">eat</span> <span word="bananas">bananas</span> <span word="without">without</span> <span word="them">them</span>, <span word="according">according</span> <span word="to">to</span> <span word="Nicholas">Nicholas</span> <span word="D">D</span>. <span word="Gillitt">Gillitt</span>, <span word="a">a</span> <span word="US">US</span> <span word="academic">academic</span> <span word="who">who</span> <span word="shed">shed</span> <span word="some">some</span> <span word="light">light</span> <span word="on">on</span> <span word="the">the</span> <span word="mystery">mystery</span> <span word="this">this</span> <span word="week">week</span> <span word="in">in</span> <span word="a">a</span> <span word="report">report</span> <span word="by">by</span> <span word="Huffington">Huffington</span> <span word="Post">Post</span>.</p><p>根据美国学者尼古拉斯•<span word="D">D</span>•吉略特所言，尽管这些韧丝可能不是最美味的，但其实它们很重要。没有它们的话我们就无法吃到香蕉。本周在《赫芬顿邮报》的一篇报道中，他向大家揭开了这一秘密。</p><p><span word="The">The</span> <span word="clue">clue</span> <span word="as">as</span> <span word="to">to</span> <span word="why">why</span> <span word="those">those</span> <span word="strands">strands</span> <span word="are">are</span> <span word="so">so</span> <span word="important">important</span> <span word="is">is</span> <span word="in">in</span> <span word="their">their</span> <span word="name">name</span>.</p><p>为什么这些韧丝如此重要？答案就隐藏在名字里。</p><p><span word="Phloem">Phloem</span> <span word="is">is</span> <span word="one">one</span> <span word="of">of</span> <span word="two">two</span> <span word="types">types</span> <span word="of">of</span> <span word="transport">transport</span> <span word="tissue">tissue</span> <span word="that">that</span> <span word="you">you</span> <span word="can">can</span> <span word="find">find</span> <span word="in">in</span> <span word="all">all</span> <span word="plants">plants</span>, <span word="and">and</span> <span word="moves">moves</span> <span word="nutrients">nutrients</span> <span word="and">and</span> <span word="other">other</span> <span word="substances">substances</span> <span word="around">around</span> <span word="the">the</span> <span word="whole">whole</span> <span word="plant">plant</span>.</p>
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