钱，昨天——今天——明天
<p>钱，也就是货币。在钱的发展的历史中，它以实物货币、金属货币、纸币、电子货币等等的形式出现。</p><p><span word="Money">Money</span> <span word="is">is</span> <span word="money">money</span>. <span word="In">In</span> <span word="the">the</span> <span word="history">history</span> <span word="of">of</span> <span word="the">the</span> <span word="development">development</span> <span word="of">of</span> <span word="money">money</span>, <span word="it">it</span> <span word="appears">appears</span> <span word="in">in</span> <span word="the">the</span> <span word="form">form</span> <span word="of">of</span> <span word="physical">physical</span> <span word="currency">currency</span>, <span word="metal">metal</span> <span word="currency">currency</span>, <span word="paper">paper</span> <span word="currency">currency</span>, <span word="electronic">electronic</span> <span word="currency">currency</span> <span word="and">and</span> <span word="so">so</span> <span word="on">on</span>.</p><p>钱的昨天就是一些实物货币、金属货币。实物货币就是一些古希腊时的牛和羊、非洲和印度的象牙、美洲土着人和墨西哥人的可可豆这一类的东西。而这些实物货币对人类来说，很不方便也很不安全。所以很快就被淘汰了。接着就产生了金属货币。金属货币最初是由铜等低价的金属充当的，后来就逐渐固定在金银上。我国的古铜币有刀币、布币、铲币、环钱等。虽然金属货币比起实物货币要方便些，但还是有点笨重了，而且也不够安全，所以不久后也被淘汰了。</p><p><span word="Yesterday">Yesterday</span>'<span word="s">s</span> <span word="money">money</span> <span word="was">was</span> <span word="some">some</span> <span word="real">real</span> <span word="money">money</span>, <span word="metal">metal</span> <span word="money">money</span>. <span word="The">The</span> <span word="real">real</span> <span word="currency">currency</span> <span word="is">is</span> <span word="something">something</span> <span word="like">like</span> <span word="cattle">cattle</span> <span word="and">and</span> <span word="sheep">sheep</span> <span word="of">of</span> <span word="ancient">ancient</span> <span word="Greece">Greece</span>, <span word="ivory">ivory</span> <span word="of">of</span> <span word="Africa">Africa</span> <span word="and">and</span> <span word="India">India</span>, <span word="cocoa">cocoa</span> <span word="of">of</span> <span word="Native">Native</span> <span word="Americans">Americans</span> <span word="and">and</span> <span word="Mexicans">Mexicans</span>. <span word="These">These</span> <span word="real">real</span> <span word="currencies">currencies</span> <span word="are">are</span> <span word="inconvenient">inconvenient</span> <span word="and">and</span> <span word="unsafe">unsafe</span> <span word="for">for</span> <span word="human">human</span> <span word="beings">beings</span>. <span word="So">So</span> <span word="it">it</span> <span word="was">was</span> <span word="eliminated">eliminated</span> <span word="soon">soon</span>. <span word="Then">Then</span> <span word="came">came</span> <span word="metal">metal</span> <span word="money">money</span>. <span word="Metal">Metal</span> <span word="money">money</span> <span word="was">was</span> <span word="initially">initially</span> <span word="made">made</span> <span word="of">of</span> <span word="low">low</span>-<span word="priced">priced</span> <span word="metals">metals</span> <span word="such">such</span> <span word="as">as</span> <span word="copper">copper</span>, <span word="and">and</span> <span word="later">later</span> <span word="gradually">gradually</span> <span word="fixed">fixed</span> <span word="on">on</span> <span word="gold">gold</span> <span word="and">and</span> <span word="silver">silver</span>. <span word="China">China</span>'<span word="s">s</span> <span word="ancient">ancient</span> <span word="copper">copper</span> <span word="coins">coins</span> <span word="include">include</span> <span word="knife">knife</span> <span word="coins">coins</span>, <span word="cloth">cloth</span> <span word="coins">coins</span>, <span word="shovel">shovel</span> <span word="coins">coins</span> <span word="and">and</span> <span word="ring">ring</span> <span word="coins">coins</span>. <span word="Although">Although</span> <span word="metal">metal</span> <span word="currency">currency</span> <span word="is">is</span> <span word="more">more</span> <span word="convenient">convenient</span> <span word="than">than</span> <span word="real">real</span> <span word="currency">currency</span>, <span word="it">it</span> <span word="is">is</span> <span word="a">a</span> <span word="bit">bit</span> <span word="cumbersome">cumbersome</span> <span word="and">and</span> <span word="unsafe">unsafe</span>, <span word="so">so</span> <span word="it">it</span> <span word="was">was</span> <span word="eliminated">eliminated</span> <span word="soon">soon</span>.</p>
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