etiquette

n. /ˈetɪkət/ B2

礼仪；礼节

The formal rules for polite behavior in society.

仙境例句

Good etiquette says you should not rest your elbows on a sleeping Dormouse.

按礼仪来说，可不该把胳膊肘搁在一只睡着的睡鼠身上。