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(1) 努力，嘗試 (use of all one's strength when one is trying hard to do sth) [U]： put a lot of～into learning to swim/into one's work 努力學(xué)游泳/努力工作; Learning a foreign language requires/needs～. 學(xué)外語要/需要付出努力。save/waste～省力/費(fèi)力; It takes very little～to keep your shoes polished. 費(fèi)不了多大的勁就可以使你的鞋保持光潔?！纪?power，force，energy，labour，struggle;

(2) 努力，奮斗 (strong attempt; struggle) [C]： make an/every～to do sth 努力/竭盡全力做某事; His～to run the mile in four minutes succeeded. 他要在四分鐘之內(nèi)跑一英里的努力成功了。It was an～to get up early. 早起很費(fèi)勁。by joint～s 共同努力; concentrate one's～s on sth 集中精力做某事; in a common～共同努力; redouble one's～s 加倍努力; relax one's～s 放松; spare no～不遺余力;〖同〗attempt，try;

(3) (努力的)結(jié)(成)果;成就 (result of an attempt; achievement) [C]：the latest～最新成果; Your drawing is a good～. 你的畫是一幅佳作。a fine literary/art～ 文學(xué)/藝術(shù)杰作;

→′effortless adj 不費(fèi)力的;

【辨異】effort與application、endeavour和exertion的區(qū)別見APPLICATION。