The first is collision detection in virtual battlefield environment.
一是研究了虚拟战场环境下的碰撞检测技术。
参考来源 - 飞行模拟器视景仿真系统设计与关键技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
"they made a tour of Civil War battlefields"
以上来源于: WordNet
N-COUNT A battlefield is a place where a battle is fought. 战场
...the struggle to save America's Civil War battlefields.
…保存美国内战战场的努力。
N-COUNT You can refer to an issue or field of activity over which people disagree or compete as a battlefield. 斗争的领域; 争论的问题
...the domestic battlefield of family life.
…家庭生活的内部问题。
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