Cold front
最近两天，随着较强冷空气的逐渐逼近，北方大部分地区的温度急剧下降，让人们感到秋天的凉意浓浓。预计冷空气过后，明后天的最高气温在20℃左右，最低气温将降至8-6℃。请看报道：
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"冷锋"，即冷空气气团的前锋部分。Front在气象学中指的是"锋"，也就是冷暖气流的交界处。如：active front（活跃锋），arctic front（北极锋）。此外，"寒流"可表达为cold current。