According to the traditional principle of freedom of contract, the parties can decide whether to contract or not.
在传统契约自由原则下，当事人之间有缔约与否的自由。
As a restricted measure to principle of freedom of contract, the compulsory contracting system plays an important part in protecting the profits of inferiors, safeguarding the justice of contract.
强制缔约制度作为对合同自由原则的限制措施，对保护弱者利益、维护合同正义发挥着重要的作用。
The essence of this principle is to defend the freedom of contract.
情事变更原则的本质是维护合同自由。
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