polite, respectful, or considerate in manner 有礼貌的;谦恭的;周到的;客气的
派生 courteously adverb courteousness noun 语源
Middle English (meaning 'having manners fit for a royal court'): from Old French corteis, based on Latin cohors 'yard, retinue' (see court). The change in the ending of the 16th cent. was due to association with words ending in -eous