自双方签字之日起生效
It shall come into force on the date of signature by both parties
以上为机器翻译结果，长、整句建议使用 人工翻译 。
本合同自双方签字之日起生效，合同期满时自动终止。
This contract takes effect on the date signed by both parties and will automatically expire when the contract ends.
本合同自双方签字之日起生效，合同期满即自行失效。
This contract shall take effect on the date signed by both parties and shall be automatically invalidated when it expires.
本合同自双方签字之日起生效，合同执行期内，甲乙双方均不得随意变更或解除合同。
The contract will be taken effect once both parties' countersignature. During the period of execution, any of party can not amend or cancel the contract at random.
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