本合同修改书由各方指定的授权代表签订。的翻译：Modify this contract signed by the authorized representatives of the parties to specify. 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

This contract amendment thereto authorized representative designated by the parties signed.

Modify this contract signed by the authorized representatives of the parties to specify.

This contract revises the book the authorization which assigns by all quarters to represent the sign.

Modify this contract signed by the authorized representatives of the parties to specify.