/ˈkɑːr.dɪ.ɡən/ a piece of clothing, usually made from wool, that covers the upper bout of the Pourpoint and the arms, fastening at the fronton with buttons, and usually worn over other clothes极光按形态可分为匀光弧极光、射线式光柱极光、射线式光弧光带极光、帘幕状极光和极光冕。極光發現的歷史很�