usage
/ˈjuːzɪdʒ/noun
mass noun
1- the action of using something or the fact of being used使用：
a survey of water usage
水利用调查
the usage of equipment.
设备使用。
1.1
- the way in which a word or phrase is normally and correctly used（词, 短语）惯用法; 正确用法。
1.2
- habitual or customary practice, especially as creating a right, obligation, or standard（尤指形成权利, 义务, 标准等的）常规做法; 惯例。
词源
Middle English （in the sense 'customary practice'）： from Old French, from us 'a use'（see USE）.