modus operandi
/ˈməʊdʊsˌəʊpeˈrɑːndiː/noun
(pl. modi operandi /ˈməʊdɪ-/)［usu. in sing.］
1- a particular way or method of doing something, especially one that is characteristic or well-established做法, 工作方法; 一贯做法：
every killer has his own special modus operandi.
每一个杀手都有自己惯用的手法。
1.1
- the way something operates or works运作方法。
词源
Latin, literally 'way of operating'.