经过正式授权并代表投标人的翻译：Duly authorized representatives and bidders 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

And through its duly authorized representative of the bidder

Duly authorized representatives and bidders

After is authorized and represents the tenderer officially

Bidders and duly authorized representatives

Duly authorized representatives and bidders