变更请求可以直接或间接、内部或外部提出，可以是可选择的，也可以是法律或合同强制要求的。
Requests for a change can be direct or indirect, externally or internally initiated, and can be optional or legally/contractually mandated.
第八条本协议的变更必须由合作各方协商一致，合作一方如需提出变更合同的请求，必须以书面的形式提出。
Article 8 the modification of this agreement by the parties agree to cooperate, cooperative party to the contract, change requests must be in writing form.
双方当事人可依情事变更原则就合同的变更部分进行协商，协商不成可请求法院公裁。
The both privies can negotiate with the change of contract according to changed circumstances, if the negotiation burst, they can ask the court to arbitrate .
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