a framework of steel bars raised on side supports to bridge over or around something; can display railway signals above several tracks or can support a traveling crane etc.
gantry的用法和樣例：
例句
用作名詞 (n.)
This machine is called Bridge Gantry Crane. 這種機器叫路橋門式起重機。
Single-girder gantry crane is a gantry crane. 單主梁門式起重機是門式起重機的一種。
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