key /ki:/ I. n. ［c］ 1. 钥匙 (常与to连用，也可与of连用): use one’s key to open the door 用钥匙开门Have you got the key to/of the door? 你有这个门的钥匙吗? Knowledge is a treasure, but practice is the key to it. 知识是一座宝库，而实践是打开宝库的钥匙。 2.答案：the key to the puzzle 谜底；the key to success 成功的秘诀 Do you know the key to the grammar exercises? 你知道这些语法练习的答案吗? 3.关键；关键性的，重要的(作定语)：This is the key to world peace.这是世界和平的关键。He has a key position in the department.他在该部门中居于重要位置。 4.(钢琴、打字机)键： Don’t hit/strike the keys of the typewriter so hard. 不要把打字机键敲得这么重。Press (tap) the keys of a piano.按(轻击)钢琴的键。‖II. vt. 用键盘输入：key in把…输入计算机：You need to key this data in. 你需要把这些数据输入。