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IELTS BNC: 1267 COCA: 1093
key
kiː ki
Word forms: plural , 3rd person singular present tense keys, present participle keying, past tense , past participle keyed
1 N-COUNT

鑰匙 A key is a specially shaped piece of metal that you place in a lock and turn in order to open or lock a door, or to start or stop the engine of a vehicle. 鑰匙

  • They put the key in the door and entered. [+ in]

    他們用鑰匙打開門進去了。

  • She reached for her coat and car keys.

    她伸手拿外套和汽車鑰匙。

SYN opener, door key, latchkey
2 N-COUNT [usually plural]

（計算機或打字機的）鍵 The keys on a computer keyboard or typewriter are the buttons that you press in order to operate it. （計算機或打字機的）鍵
3 N-COUNT [usually plural]

（鋼琴或風琴的）鍵 The keys of a piano or organ are the long narrow pieces of wood or plastic that you press in order to play it. （鋼琴或風琴的）鍵
4 N-VAR

（音樂的）調 In music, a key is a scale of musical notes that starts on one specific note. （音樂的）調

  • ...the key of A minor. [+ of]

    A小調

SYN tone, sound, pitch, timbre
5 N-COUNT

（地圖、圖解或科技書籍的）略語表，符號表，凡例 The key on a map or diagram or in a technical book is a list of the symbols or abbreviations used and their meanings. （地圖、圖解或科技書籍的）略語表，符號表，凡例

  • You will find a key at the front of the book.

    你會在書的前面找到略語表。

SYN guide, explanation, interpretation, indicator
6 ADJ [ADJ n]

最重要的；關鍵的 The key person or thing in a group is the most important one. 最重要的；關鍵的

  • He is expected to be the key witness at the trial.

    他將成爲審判的關鍵證人。

  • Education is likely to be a key issue in the next election.

    在下屆選舉中教育可能成爲最重要的一個議題。

7 N-COUNT

關鍵；要訣 The key to a desirable situation or result is the way in which it can be achieved. 關鍵；要訣

  • The key to success is to be ready from the start. [+ to]

    成功的關鍵在於從一開始就要準備充分。

  • Diet and relaxation are two important keys to good health.

    限制飲食和放鬆身心是保持健康的兩個要訣。

SYN answer, means, secret, solution
8 See also:

master key  under lock and key→see: lock 
Phrasal verbs:

key in
ThesaurusWord Partnership
Thesauruskey Also look up:
N.

code, explanation, guide 5

ADJ.

critical, important, major, vital 6

Word PartnershipUse key with:
VERB.

turn a key 1

N.

key component, key decision, key factor, key figure, key ingredient, key issue, key official, key player, key point, key question, key role, key word 6

key to success 7

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