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Our realty agent says the sales contract is valid.
我们的房地产代理人称该销售合同是有效的。
《柯林斯英汉双解大词典》
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No modification of the Contract is valid unless agreed or evidenced in writing.
5除非书面约定或证明，任何对合同的修改都是无效的。
youdao
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No modification of the Contract is valid unless agreed or evidenced in writing.
5除非书面约定或证明，任何对合同的修改都是无效的。
youdao