rules of engagement
noun [ plural ] military specialized uk/ˌruːlz əv ɪnˈɡeɪdʒ.mənt/ us/ˌruːlz əv ɪnˈɡeɪdʒ.mənt/
交战规则
orders that soldiers fighting in a war are given about what they can and cannot do
The soldier fired on a wounded man, an apparent breach of the rules of engagement. 这名战士向一个伤员开枪，明显违反了交战规则。