SAT阅读中的常见文化词条
<p> 在<span word="SAT">SAT</span>阅读中我们常常会碰到一些常见的文化词条，有时候对这些知识不熟悉，会影响我们对整篇文章的理解，所以了解一些专有名词会提高我们的<span word="SAT">SAT</span>阅读能力。今天我们主要给大家介绍两个词条，分别是<span word="Sonar">Sonar</span>和<span word="Dolphins">Dolphins</span>。</p><p> 1，<span word="Sonar">Sonar</span></p><p> <span word="Sonar">Sonar</span> <span word="is">is</span> <span word="a">a</span> <span word="technique">technique</span> <span word="that">that</span> <span word="uses">uses</span> <span word="sound">sound</span> <span word="propagation">propagation</span> <span word="to">to</span> <span word="navigate">navigate</span>, <span word="communicate">communicate</span> <span word="or">or</span> <span word="to">to</span> <span word="detect">detect</span> <span word="other">other</span> <span word="vessels">vessels</span>. <span word="Sonar">Sonar</span> <span word="may">may</span> <span word="be">be</span> <span word="used">used</span> <span word="as">as</span> <span word="a">a</span> <span word="means">means</span> <span word="of">of</span> <span word="acoustic">acoustic</span> <span word="location">location</span>. <span word="The">The</span> <span word="term">term</span> <span word="sonar">sonar</span> <span word="is">is</span> <span word="also">also</span> <span word="used">used</span> <span word="for">for</span> <span word="the">the</span> <span word="equipment">equipment</span> <span word="used">used</span> <span word="to">to</span> <span word="generate">generate</span> <span word="and">and</span> <span word="receive">receive</span> <span word="the">the</span> <span word="sound">sound</span>. <span word="The">The</span> <span word="frequencies">frequencies</span> <span word="used">used</span> <span word="in">in</span> <span word="sonar">sonar</span> <span word="systems">systems</span> <span word="vary">vary</span> <span word="from">from</span> <span word="infrasonic">infrasonic</span> <span word="to">to</span> <span word="ultrasonic">ultrasonic</span>.</p><p> 声纳一种利用水下声音传播来导航，联络或侦查其他船只的技术。它可用于声音定位。这个术语还指产生和接收声波的设备。声纳所使用的频率从次声到超声不等。</p><p> 2，<span word="Dolphins">Dolphins</span></p><p> <span word="Dolphins">Dolphins</span> <span word="are">are</span> <span word="marine">marine</span> <span word="mammals">mammals</span> <span word="that">that</span> <span word="are">are</span> <span word="closely">closely</span> <span word="related">related</span> <span word="to">to</span> <span word="whales">whales</span> <span word="and">and</span> <span word="porpoises">porpoises</span>. <span word="There">There</span> <span word="are">are</span> <span word="almost">almost</span> <span word="forty">forty</span> <span word="species">species</span> <span word="of">of</span> <span word="dolphin">dolphin</span> <span word="in">in</span> <span word="seventeen">seventeen</span> <span word="genera">genera</span>. <span word="They">They</span> <span word="vary">vary</span> <span word="in">in</span> <span word="size">size</span> <span word="from">from</span> 1.2 <span word="meters">meters</span> <span word="and">and</span> 40 <span word="kilograms">kilograms</span>, <span word="up">up</span> <span word="to">to</span> 9.5 <span word="m">m</span> <span word="and">and</span> 10 <span word="ton">ton</span>. <span word="They">They</span> <span word="are">are</span> <span word="found">found</span> <span word="worldwide">worldwide</span>, <span word="mostly">mostly</span> <span word="in">in</span> <span word="the">the</span> <span word="shallower">shallower</span> <span word="seas">seas</span> <span word="of">of</span> <span word="the">the</span> <span word="continental">continental</span> <span word="shelves">shelves</span>, <span word="and">and</span> <span word="are">are</span> <span word="carnivores">carnivores</span>, <span word="mostly">mostly</span> <span word="eating">eating</span> <span word="fish">fish</span> <span word="and">and</span> <span word="squid">squid</span>. <span word="Dolphins">Dolphins</span> <span word="are">are</span> <span word="considered">considered</span> <span word="to">to</span> <span word="be">be</span> <span word="amongst">amongst</span> <span word="the">the</span> <span word="most">most</span> <span word="intelligent">intelligent</span> <span word="of">of</span> <span word="animals">animals</span> <span word="and">and</span> <span word="their">their</span> <span word="often">often</span> <span word="friendly">friendly</span> <span word="appearance">appearance</span> <span word="and">and</span> <span word="seemingly">seemingly</span> <span word="playful">playful</span> <span word="attitude">attitude</span> <span word="have">have</span> <span word="made">made</span> <span word="them">them</span> <span word="popular">popular</span> <span word="in">in</span> <span word="human">human</span> <span word="culture">culture</span>.</p>
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