经双方协商一致同意后，协议才能生效。否则本协议在到期后自动失效。
This Agreement will take effect only after the unanimous consent of both parties by negotiation, otherwise, it shall automatically be of no effect upon its expiration.
本保证函一经到期，将自动失效，而不管是否退还我方。 收藏。
The Letter of Guarantee shall become automatically null and void upon its expiration regardless of whether it is returned to us or not.
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