semi-portal crane的用法和樣例：
例句
- This machine is called Bridge Gantry Crane.
這種機器叫路橋門(mén)式起重機。 - Successful development of the crane solves the problems of high-speed railways' unballasted track laying and brings obvious economic and social benefits.
博格板大懸臂門(mén)式起重機的研制成功解決了高速鐵路無(wú)碴軌道板的鋪設難題，創(chuàng )造了明顯的經(jīng)濟和社會(huì )效益。
