债的相对性原则对保护个人自由的作用卓有成效。
The relativity of obligatory rights is largely effective to protect an individual's freedom.
合同产生之初，因合同当事人的特定性而形成合同相对性原则。
Privity of contract resulted from the parties of contract at the beginning of contract.
因为利益第三人理论的出现，使得合同相对性原则不再惟我独尊。
Since the third party beneficiary contract and the corresponding theory appeared, the principle of contract relativity has not been unique.
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