approximationn.
英 ə,prɒksɪ'meɪʃn | 美 ə'prɑksə'meʃən
中文n. [数] 近似法；接近；[数] 近似值
词根词源
approximation (n.)early 15c., "act of coming near or close," noun of action from approximate (v.). Meaning "result of approximating" is from 1650s.
关键词