Both parties need to sign the contract.

双方当事人都必须在合约上签名。

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If both parties wish, to continue the partnership, we could extend the contract.

只要双方愿意，合同期满后我们还可以续签。

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Any modification alteration to the contract shall be made with the consent of both parties.

必须事先经双方同意，合同方可修改。

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Any modification alteration to the contract shall be made with the consent of both parties.

作出任何对合同的改变时，都要经过双方的同意。

youdao

Any modification alteration to the contract shall be made with the consent of both parties.

作出任何对合同的改变时，都要经过双方的同意。

youdao