administrator [ədˈmɪnɪstreɪtə(r)]：管理人；行政官addressor [ˈædrəsə(r)]：发信人；发言人ambassador [æmˈbæsədə(r)]：大使；使节ancestor [ˈænsestə(r)]：祖宗；祖先author [ˈɔ
early 14c.， “unmarried，” from Old French sengle， sangle “alone， unaccompanied;simple， unadorned，” from Latin singulus “one， one to each， individual， separate” ， from PIE semgolo‑， suffixed form of root sem- “one;as one， together with.”
