rectangular spar造句

例句与造句

1. They were constructed from a mixture of wood and metal, based on two rectangular spars and fabric covered.
2. Starting 1 January 1989 the front spar was changed to a rectangular spar and an outboard drag brace was added, increasing wing rigidity.
3. It's difficult to find rectangular spar in a sentence. 用rectangular spar造句挺难的