1. 钥孔形弹孔：Kentucky Rifle [肯塔基来福枪] | Keyhole [钥孔形弹孔] | Kick [后座感]

1. 锁眼；钥匙孔
    A keyhole is the hole in a lock that you put a key in.

    e.g. I looked through the keyhole.
           我通过锁眼向里看。

1. the hole where a key is inserted