劍橋詞典used to form nouns that refer to an area of work or study (用于構(gòu)成表示工作領(lǐng)域或?qū)W科的名詞) the world of politics 政界 the study of economics /physics /ethics 經(jīng)濟學/物理學/倫理學研究 返回 -ics