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古中國鎖具的鑰匙可依其
數目來分類
；使用一把鑰匙
來開鎖者，其鑰匙稱為簡單鑰
匙，使用二把以上的鑰匙來開
鎖者，其鑰匙稱為複合鑰匙。
大部份的古鎖以簡單鑰匙即可
開啟，有些古鎖則必須利用複
合鑰匙方可打開。
Keys of ancient Chinese locks can
be classified into simple keys and
compound keys
, according to the
number of keys needed for opening
the locks. Most ancient Chinese
locks were designed to open by one
key, i.e., by a simple key. Some
were special des igned to have
two or more different keys, i.e., a
compound key, for opening the lock.