10-4 appendix of this contract shall be confirmed by both parties to this contract after the indispensable part of this contract, the effectiveness and consistent.

4本合同附件应经双方确认后成为本合同不可缺少的组成部分，效力与本合同一致。

youdao

Environmental protection is a complicated and systematic social engineering which needs the efforts of all parties, so public participation is an indispensable link.

环境保护是一项复杂的社会系统工程，需要各方共同努力，公众参与是其中不可或缺的一个重要环节。

youdao

The political research unit provides background information and reliable statistics on parties, policies and polling, producing indispensable election guides which are studied and treasured by politics geeks and other staff across the corporation.

BBC: This is BBC News

And we will see the challenge, successfully met by Lincoln, of bringing together people of different political parties and different ideologies to achieve major goals, along with the indispensable requirement of a clear vision and an unbreakable determination in pursuit of an ideal.

CNN: What Obama can learn from Lincoln