纤维增强的塑料和纤维增强的金属材料已经使用了很长时间。

Fiber - reinforced plastics and metals have been available for some time.

youdao

纤维增强的塑料和纤维增强的金属材料已经使用了很长时间。

Fiber - reinforced plastics and metals have been available for some time.

youdao