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n (1)線索(sth (such as fact，evidence，information，object，etc)that helps to find an answer to a problem or mystery)[C][N(to)]：The car number/footprint/fingerprint was a～to the identity of the murderer.汽車號(hào)碼/腳印/指紋是查明兇手身份的線索。have/find/leave no～s as to who murdered sb沒(méi)有/沒(méi)找到/沒(méi)留下行兇者的線索;The～to solving the energy problem lies in conservation.解決能源問(wèn)題的答案在于資源保護(hù)?！纪絪ign，hint，trace，indication，evidence，mark，key;

(2)填字游戲中要填的字(word or words that help(s) to solve a crossword puzzle)[C]：I can't do/answer the third～in the crossword.我做不出這填字游戲中的第三個(gè)字。

not have a clue (infml) 1)一無(wú)所知;不知如何做某事：He hasn't a～about modern art.他對(duì)現(xiàn)代藝術(shù)一無(wú)所知。She doesn't have a～about how to change the wheel of a car.她根本不知道怎么換車輪。2)愚蠢，無(wú)能(derog)：Don't ask him to do it — he hasn't a～.別求他干這事——他沒(méi)這本事。

→′clueless adj 愚蠢的，無(wú)能的;

v

clue up (about/on sth)(v adv)熟知(vt)(通常 pass)(infml)：He's really/very～d up on/about modern painting.他通曉現(xiàn)代繪畫(huà)。

clue in (on sth)(v adv)提示(vt)(infml)：～sb in on the latest developments讓某人了解事態(tài)的最新發(fā)展