norm

noun [专属名词]社会准则，行为规范；标准，平均水平；常态，平常事物；模方；<澳，非正式>诺姆（指整日呆在家中看电视的懒人，尤指看体育节目）

If you say that a situation is the norm, you mean that it is usual and expected. ^{惯例; 常规Families of six or seven are the norm in Borough Park. 六七口人的家庭在菠萝园是常事儿。}