Any changes to this Contract shall be made only by mutual written agreement of both Parties.

本合同的任何修改，都应经过双方的协议通过才能有效。

youdao

In order to specify the rights and obligations of both parties, a contract prescribing a time limit shall be signed.

为了明确双方的权利和义务，每个合作项目都应签订有一定时限的合同。

youdao

The party awarding contract and the contractor shall conclude an agricultural contract to define the rights and duties of both parties.

发包方和承包方应当订立农业承包合同，约定双方的权利和义务。

youdao

The nikah mut'ah consists of a verbal or written contract in which both parties agree the length of time and conditions for the marriage.

BBC: I do... for now. UK Muslims revive temporary marriages

Mentors and mentees meet approximately once a month and together both parties draw up a contract and set specific goals to be met within a defined period of time, from 6 to 12 months.

UNESCO: Social and Human Sciences