key/kiː/

n.

➊ a small specially shaped piece of metal used for locking or unlocking a door, starting a car, etc.

➋ a set of answers to exercises or problems

➌ any of the buttons you press to produce letters on a computer or to make sounds on a piano

➍ [the ~] an important thing that helps you to understand or achieve sth

n.

➊ [C] 钥匙：a car/door key 车/门钥匙

◇a bunch of keys 一串钥匙

◇[key to sth] a spare key to the house 房子的备用钥匙

➋ [C] 答案，解答：[key to sth] The key to the test is at the back of the book. 测试答案在书的后面。

➌ [C] （电脑、钢琴等的）键：Press the “Enter” key to finish. 按“回车”键结束。

◇a piano key 钢琴的琴键

➍ [the ~] [S] 关键：[the key to sth] The key to success is hard work. 成功的关键是努力工作。

常犯错误

✗ Diet and exercise are the key for good health.

✓ Diet and exercise are the key to good health. 饮食和锻炼是身体健康的关键。