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，制造要求高，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(chē)制造廠(chǎng)商一般樂(lè )于將他們生產(chǎn)的吊車(chē)和橋架的詳細尺寸提供給結構工程師。
