1. A fortified strip or boundary usually protecting a military position. 
   周界筑有防御工事的地带或边界，常用以保护一军事地点
2. An object, such as a post or stone, fixed in the ground so as to mark a boundary or position. 
   标石立在地上标示边界或地点的物体，如标杆或界石
3. atmospheric boundary layer physics 
   大气边界层物理
4. chemical reaction boundary layer 
   化学反应边界层
5. A boundary between countries. 
   国界，边界国家之间的边界

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