customary

customary
/ˈkʌstəmərɪ; ?@ -merɪ; `kʌstəmˌɛrɪ/ adj
according to custom; usual 合乎习俗的; 依照习俗的; 习惯上的
    Is it customary to tip waiters in your country? 在贵国依照惯例是否应该付给服务员小费?
    She gave the customary speech of thanks to the chairman. 她照例向主席致感谢辞.

牛津英汉双解词典