惯例

convention; precedents sub silentio[拉];(usual)practice;usage;precedent（用于法律）
根据～，主宾坐在主人的右边。According to usage,the guest of honour sits on the right side of the host./国际～ international practice/外交～diplomatic usage (or practice)/行业交易～usage of trade /援引～ invoke(or cite)a precedent/作战～usage of warfare/～法code of practice;conventional law