crane span structures的用法和樣例：
例句
- It is demanding to fabricate crane bridge as large welded structure, so the upgrade to change its span is very challenging.
摘要起重機橋架作為大型焊接結構件，製造要求高，其改制具有典型意義。 - Crane makers are usually happy to give details of the dimensions of their cranes and bridges to structural engineers.
吊車製造廠商一般樂於將他們生產的吊車和橋架的詳細尺寸提供給結構工程師。
