n.构台,桶架
On top of the gantry the American flag flew.
台架顶上飞舞着美国国旗。
To be positioned and handled by hatch cover gantry crane.
用舱口龙门吊来吊放它们.
If the site is small, it may be commanded by a gantry crane.
假如场地小, 则可采用龙门式吊车进行操作.