本设计对提高产品档次，减轻产品重量，扩展产品性能都有显著效果。

This design has marked effect for improving product performance and lighten product weight.

youdao

本设计对提高产品档次，减轻产品重量，扩展产品性能都有显著效果。

This design has marked effect for improving product performance and lighten product weight.

youdao