名詞 out of doors:

1. where the air is unconfined
   同義詞：outdoors, out-of-doors, open air, open

副詞 out of doors:

1. outside a building
   同義詞：outside, outdoors, alfresco

1. It is warm enough for you to play out of doors.
   天氣很暖和，你可以出去玩。
2. Cowboys spend most of their time out of doors.
   牛仔大部分時間都是在戶外度過的。