合同自签字之日起生效
The contract shall come into effect as of the date of signature
以上为机器翻译结果，长、整句建议使用 人工翻译 。
本合同自甲、乙双方签字或盖章之日起生效，涂改或未经书面授权代签无效。
XIII. The contract shall go into force after the signature of both parties. Alteration or signature without written authorization is invalid.
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.
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