When there is no meeting of the minds, there is no valid contract.
如果没有合意，就不存在有效的合同。
To make a valid contract, generally speaking, we need at least two parties;
一般而言，为订立一份有效合同，至少需要两方当事人；
To create a valid contract an offer must be accepted without qualifications.
只有毫无保留地接受要约才能成立一个有效的合同。
This contract is valid for four years.
这份合同三年有效。
The contract is no longer valid.
那分合同不再有效。
No addition or modification to this contract shall be valid unless made in writing.
除非以书面形式做成，对本合同所进行的补充和修改均无效。
No addition or modification to this contract shall be valid unless made in writing.
除非以书面形式做成，对本合同所进行的补充和修改均无效。
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