n.(起重的)龍門架；跨軌信號架；(火箭發(fā)射設(shè)備的)豎架
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。
