Cold front

　　最近兩天，隨著較強(qiáng)冷空氣的逐漸逼近，北方大部分地區(qū)的溫度急劇下降，讓人們感到秋天的涼意濃濃。預(yù)計冷空氣過后，明后天的最高氣溫在20℃左右，最低氣溫將降至8-6℃。請看報道：

　　Residents of North China have to get their heavy woollens out from today with a cold front closing in and temperatures set to drop appreciably. Beijingers will feel autumn slipping away with the leaves blown away by increasingly cold winds. Winter will set in by the middle of next month.

　　Cold front 的意思是"冷鋒"，即冷空氣氣團(tuán)的前鋒部分。Front在氣象學(xué)中指的是"鋒"，也就是冷暖氣流的交界處。如：active front（活躍鋒），arctic front（北極鋒）。此外，"寒流"可表達(dá)為cold current。