A contract of sale need not be concluded in or evidenced by writing and is not subject to any other requirement as to form.
销售合同无需以书面订立或书面证明，在形式方面也不受任何其他条件的限制。
A contract calling for the sale of land is not enforceable unless it is in writing or evidenced by a written memorandum.
规定要进行土地买卖的合同，非以书面订立或由书面备忘录佐证，不得强制执行。
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。
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