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n (1)鑰匙(shaped metal device used to open or close a lock，wind a clock，start or stop a car engine，etc)[C]：a door/car～門/汽車鑰匙;an ignition～ 點火開關(guān)鑰匙;the～to the front door 前門鑰匙;have a～cut/made to fit a lock 給鎖配一把鑰匙;put/turn the～in the lock 把鑰匙塞進(jìn)鎖孔/轉(zhuǎn)動鑰匙;〖同〗opener，passkey;

(2)轉(zhuǎn)柄(shaped device used for turning a part in a machine，etc)[C]：a～to open this valve/turn off the central heating 打開這個閥門/關(guān)閉集中供暖裝置的開關(guān);a～for winding the clock 給這個鐘上弦的鑰匙;

(3)鍵(button that one presses to make an instrument or machine work)[C]：the～s of a piano/a typewriter 鋼琴/打字機(jī)鍵;a row of black and white～s 一排黑白琴鍵;

(4)音調(diào)，主音(chief note of a piece of music)[C]：the～of D D調(diào);a symphony in the ～of C minor 一首C小調(diào)交響曲;a sonata in the ～of E flat minor 一首降E小調(diào)奏鳴曲;sing in a low～低調(diào)吟唱;～signature 樂譜的調(diào)號;〖同〗scale，mode;

(5)基調(diào)，調(diào)子(mood or characteristic style as of expression or thought)[C]：all in the same～千篇一律;report the event/treat this whole affair in a low～以低調(diào)報告事件/對待這個事情;

(6) 關(guān)鍵，要訣(thing that explains sth or provides an answer or solution)[C，通常sing] [N(to)]：the～to the problem/murder/an improvement of their living conditions 問題/謀殺案/他們生活條件改善的關(guān)鍵;the～to one's success or failure 決定某人成敗的關(guān)鍵;The Bosporus is the～to the Black Sea. 博斯普魯斯海峽是黑海的咽喉?！玬oney (房租之外的)小費;

(7) 解題，解答，圖例說明(answers to exercises，problems or question)[C]：a～for the use of teachers only/to the grammar exercises 專供教師用的題解/語法練習(xí)答案;a book of English tests，complete with～附題解的英語測試題;the～to a puzzle 謎底;provide the～to the mystery 提供謎底;The～on the map explains the meanings of the different colours，lines，etc.地圖上的圖例說明了不同顏色、線條等的意義?！纪絪olution，explanation，answer;

→′keyboard n 鍵盤; v 操作鍵盤;(操縱鍵盤)將資料輸入計算機(jī);′keyboarder n 操縱計算機(jī)鍵盤的人;′keyhole n 鎖眼;鑰匙孔;′keynote n 基調(diào);主音;′keypad n 小型鍵盤;′key-ring n 鑰匙環(huán)(圈);′keystone n 拱頂石;根本;關(guān)鍵;

adj 關(guān)鍵性的，極重要的(chief，major，important or essential)[作attrib]：a～position/industry/man 險要位置/主要工業(yè)/關(guān)鍵性人物;a～battle in the war/issue in the forthcoming election 戰(zhàn)爭中的重要一役/即將來臨的選舉中的關(guān)鍵性問題;the～word of a sentence 句子中的關(guān)鍵詞