key/ kiː /

1.noun [c] 
(for lock,mechanism) 钥匙

2.noun [of computer] [ typewriter] [ piano] 


3.noun [音] 


4.noun
the key (to sth) (to success,victory,peace,mystery) (某事的)关键

5.adjective [+issue] [ factor etc] 
关键的

6.vt.
(also: key in) 输入

to hold the key to sth
掌握某事的关键
the key to doing sth
做某事的关键