This machine is called Bridge Gantry Crane. 这种机器叫路桥门式起重机。
Single-girder gantry crane is a gantry crane. 单主梁门式起重机是门式起重机的一种。
gantry英英释义
Noun:
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.
