It was to him that, in etiquette, the command of the expedition belonged.
I consulted him upon a point of etiquette: if one should offer to tip the American waiter?
My father was very much the professional clergyman, having a strong sense of clerical etiquette.
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)