英语六级听力练习之食盐大战冰块
<p> <span word="Salt">Salt</span> <span word="vs">vs</span>. <span word="Ice">Ice</span></p><p> 食盐大战冰块</p><p> <span word="Y">Y</span>: <span word="Why">Why</span> <span word="does">does</span> <span word="salt">salt</span> <span word="melt">melt</span> <span word="ice">ice</span>?</p><p> 为什么食盐能让冰块融化?</p><p> <span word="D">D</span>: <span word="It">It</span> <span word="lowers">lowers</span> <span word="the">the</span> <span word="melting">melting</span> <span word="and">and</span> <span word="freezing">freezing</span> <span word="point">point</span> <span word="of">of</span> <span word="water">water</span>.</p><p> 是因为食盐将水的熔点和冰点降低了。</p><p> <span word="Y">Y</span>: <span word="Oh">Oh</span>,<span word="OK">OK</span>.<span word="Wait">Wait</span>,<span word="I">I</span> <span word="dont">dont</span> <span word="get">get</span> <span word="it">it</span>. <span word="Doesnt">Doesnt</span> <span word="that">that</span> <span word="mean">mean</span> <span word="the">the</span> <span word="salt">salt</span> <span word="make">make</span> <span word="ice">ice</span> <span word="colder">colder</span>?</p><p> 等一下，我不明白。这就意味着食盐让冰的温度变得更低吗?</p><p> <span word="D">D</span>: <span word="Let">Let</span> <span word="me">me</span> <span word="explain">explain</span>.<span word="Pure">Pure</span> <span word="water">water</span> <span word="freezes">freezes</span> <span word="at">at</span> <span word="thirty">thirty</span>-<span word="two">two</span> <span word="degrees">degrees</span> <span word="Fahrenheit">Fahrenheit</span>,<span word="right">right</span>? <span word="At">At</span> <span word="that">that</span> <span word="temperature">temperature</span> <span word="we">we</span> <span word="can">can</span> <span word="say">say</span> <span word="that">that</span> <span word="the">the</span> <span word="rate">rate</span> <span word="of">of</span> <span word="freezing">freezing</span> <span word="is">is</span> <span word="the">the</span> <span word="same">same</span> <span word="as">as</span> <span word="the">the</span> <span word="rate">rate</span> <span word="of">of</span> <span word="melting">melting</span>.</p><p> 我解释一下。纯净水的冰点是32华氏度，对吧?这个温度既是冰点也是熔点。</p><p> <span word="Y">Y</span>: <span word="So">So</span> <span word="in">in</span> <span word="other">other</span> <span word="words">words</span>, <span word="at">at</span> <span word="waters">waters</span> <span word="freezing">freezing</span> <span word="point">point</span> <span word="theres">theres</span> <span word="a">a</span> <span word="sort">sort</span> <span word="of">of</span> <span word="equilibrium">equilibrium</span> <span word="between">between</span> <span word="freezing">freezing</span> <span word="and">and</span> <span word="melting">melting</span>.</p><p> 也就是说，水的冰点就是结冰和融化的平衡。</p><p> <span word="D">D</span>: <span word="Right">Right</span>.<span word="Throwing">Throwing</span> <span word="salt">salt</span> <span word="on">on</span> <span word="ice">ice</span> <span word="upsets">upsets</span> <span word="the">the</span> <span word="balance">balance</span>.</p><p> 是的。在冰上洒盐扰乱了这种平衡。</p><p> <span word="Y">Y</span>: <span word="Upsets">Upsets</span> <span word="it">it</span> <span word="how">how</span>?</p><p> 怎么打乱的呢?</p><p> <span word="D">D</span>: <span word="The">The</span> <span word="salt">salt</span> <span word="dissolves">dissolves</span> <span word="into">into</span> <span word="the">the</span> <span word="liquid">liquid</span> <span word="water">water</span>, <span word="which">which</span> <span word="means">means</span> <span word="that">that</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="water">water</span> <span word="molecules">molecules</span> <span word="are">are</span> <span word="replaced">replaced</span> <span word="by">by</span> <span word="salt">salt</span>. <span word="Since">Since</span> <span word="there">there</span> <span word="are">are</span> <span word="now">now</span> <span word="fewer">fewer</span> <span word="liquid">liquid</span> <span word="water">water</span> <span word="molecules">molecules</span> <span word="to">to</span> <span word="be">be</span> <span word="captured">captured</span> <span word="and">and</span> <span word="frozen">frozen</span> <span word="by">by</span> <span word="the">the</span> <span word="ice">ice</span>, <span word="the">the</span> <span word="rate">rate</span> <span word="of">of</span> <span word="freezing">freezing</span> <span word="drops">drops</span>.</p>
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