1. 与...交战：be at home in 熟悉,精通 | be at war with 与...交战 | be attributed to 归于...

2. 处于交战状态, 进行竞争：be at the rootof || 是的根本 | be at war with || 处于交战状态, 进行竞争 | be at || 从事于, 做

3. 和...处于交战状态：10. by accident 偶然地 | 11. be at war with... 和...处于交战状态 | 12. be at peace with 和...和平共处

4. 与......处于战争状态：24.be dedicated to the memory of v.给某人画像以纪念...... | 25.be at war with 与......处于战争状态 | 26.would offer to (过去常常)会主动做什么