economist (n.) person who specializes in the study of economics经济学家
economise (v.) save money by spending less节约
economies (n. pl) savings积蓄
[例] We need to introduce some economies.
economy (n.) financial organization of a country经济体制
[例] a free market economy
economy class the cheapest class of a air travel经济舱
economy of scale 规模经济
