求翻译：甲、乙双方就预售事宜签署《北京商品房预售合同》的基础上，经协商一致，达成本协议，以供双方共同遵守。是什么意思？

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A and B on the pre-sale of the signing of the Beijing commodity housing in the pre-sale contract on the basis of the consensus reached, this agreement for mutual compliance.

The armor, the second grade both sides on sell in advance the matters concerned to sign "the Beijing Commodity apartment Sells in advance Contract" in the foundation, is consistent after the consultation, reaches the cost agreement, supplies both sides to observe together.

A and b both sides signed in advance on the basis of the Beijing real estate sale contract, by consensus, reached the agreement for mutual respect.

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