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【形狀】
無論是平面鑰匙孔或者是
立體鑰匙孔，其形狀相當多樣，
除了配合鑰匙頭的構形設計外，
有些還因使用者的社會地位而
異。
廣鎖的外形雖然大同小
異，但鑰匙孔的形狀卻有著多
種形式，其複雜度是按官職遞
增，代表了當時社會的階級制
度。再者，製鎖工坊皆按官府
的規定行事，不能僭越。
【
SHAPES
】
Both the planar and the spatial
designs of keyholes come in many
shapes. They were designed to
match the configuration of the key-
heads and the social status of the
owners.
Although most of the broad
locks are more or less identical with
each other, the shapes of keyholes
varied greatly with many patterns.
The higher rank the owner's social
status was, the more complex the
design of the keyholes became.
Furthermore, locksmiths designed
and manufactured locks according to
the rules of the administration court,
no transgression was allowed.