21. A contract may be modified if the parties reach a consensus through consultation.
当事人协商一致即可以变更合同。
22. Any amendments to this contract shall become effective only by a written agreement by Party A and Party B.
对本合同的任何修改，只有经甲、乙双方签署书面协议后方能生效。
23. Any annex is the integral part of this contract.
本合同一切附件均为本合同的有效组成部分。
24. Any departure from the terms and conditions of the contract must be advised in writing.
任何与合同条款相背离的地方，都应以书面形式通知。
25. Any failure by a party to carry out all or part of his obligations under the contract shall be considered as a substantial breach.
一方当事人不履行本合同的全部或任何部分义务均应被视为是根本违约。
26. Any party has no right to terminate this contract without another party‘s agreement.
未经另一方当事人同意，任何当事人均无权终止本合同。
27.Examples of void contracts are those entered as a result of misrepresentation， duress or undue influence.
因欺诈、胁迫和乘人之危而签订的合同属于可撤销合同。
28. If any of the above-mentioned clauses is inconsistent with the following additional clauses， the latter to be taken as authentic.
以上任何条款如与下列附加条款相抵触，以下列附加条款为准。
29. If there are provisions as otherwise stated in respect to contracts in other laws， such provisions shall be followed.
其他法律对合同另有规定的，应依照这些规定。
30.No consideration， no contract.
合同无对价不成立。
