A notched and grooved, usually metal implement that is turned to open or close a lock.
예문
1. a key color (기본색) 2. major key (장조) 3. in a minor key (침울한 어조로) 4. Gibraltar is the key to the Mediterranean. (지브롤터는 지중해의 관문이다) 5. all in the same key (모두 같은 목소리로, 단조롭게)
