寒潮来袭
<p>11月1日，随着寒潮天气的来袭，深秋的北京突降大雪，使原本一身金黄的京城秋色顿时披上银装。据气象专家介绍，这也是北京1987年以来的最早初雪。</p><p><span word="Cold">Cold</span> <span word="snap">snap</span> <span word="brings">brings</span> <span word="snow">snow</span>---<span word="Beijing">Beijing</span>'<span word="s">s</span> <span word="first">first</span> <span word="snowfall">snowfall</span> <span word="this">this</span> <span word="winter">winter</span>, <span word="which">which</span> <span word="began">began</span> <span word="on">on</span> <span word="Saturday">Saturday</span> <span word="night">night</span> <span word="and">and</span> <span word="lasted">lasted</span> <span word="until">until</span> <span word="Sunday">Sunday</span> <span word="afternoon">afternoon</span>, <span word="surprised">surprised</span> <span word="locals">locals</span>.</p><p>寒潮带来降雪——北京今冬的初雪让当地居民颇感意外。这场雪从上周六晚间一直持续到周日下午。</p><p>标题中的<span word="cold">cold</span> <span word="snap">snap</span>就是指“寒潮”。<span word="Cold">Cold</span> <span word="snap">snap</span>是指<span word="strong">strong</span> <span word="cold">cold</span> <span word="air">air</span>(强冷空气)由亚洲大陆西部或西北部侵袭中国时的强降温天气过程，一般多发生在秋末、冬季、初春时节。<span word="Cold">Cold</span> <span word="snap">snap</span>地面高压的前端一般都有一条<span word="cold">cold</span> <span word="front">front</span>(冷锋，冷空气前锋)。据了解，为缓解干旱，此次长时间降雪其实是有关部门进行<span word="weather">weather</span> <span word="modification">modification</span>(人工影响天气)作业的结果。</p><p>秋季的清晨，地面上常会凝结<span word="cold">cold</span> <span word="dew">dew</span>(寒露)。春初料峭的<span word="cold">cold</span> <span word="spell">spell</span>(春寒期)和夏末出其不意的<span word="Indian">Indian</span> <span word="summer">summer</span>(秋老虎)常令人措手不及。为应对此次<span word="cold">cold</span> <span word="snap">snap</span>，北京<span word="heat">heat</span> <span word="supply">supply</span>(供暖)近日全面启动，而每年的<span word="heating">heating</span> <span word="season">season</span>(供暖季)一般从11月15日开始。</p>
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