key的英語正確寫法？

adj. 關鍵的；主要的

vt. 鍵入；用鑰匙鎖上；為 ... 調音

[C]鑰匙

metal instrument shaped so that it will move the bolt of a lock

[C]關鍵,要訣

thing that provides access, control or understanding

[C]鍵

any of the set of levers that are pressed by the fingers to operate a typewriter, piano, etc.

[C](樂曲的)調; 口吻,基調

set of related notes, based on a particular note, and forming the basis of a piece of music; general tone or style of sth