A cold front is the forward edge of a mass of moving cold air.
冷锋是一团移动着的冷气流的前锋面。
A mass of cold air is moving south.
大团冷空气正在南移。
If the cold air mass is not so strong, its invasion into the center part of a wintertime tropical cyclone strengthens the tropical cyclones.
浅薄冷空气的入侵对热带气旋起加强作用，但强冷空气侵入热带气旋则容易使其减弱消亡。
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