合同之债是指因订立合同而产生的债权债务关系。在所有的债权债务关系中，合同之债是最重要的组成部分。
定金是合同之债中债的担保的一种独特而重要形式。
In legal practice, congnizance and application of earnest debt is the key of researching earnest.
摘要定金是合同之债中债的担保的一种独特而重要形式。
Earnest is a special and important form of debt assurance in contract debt.
让与合同生效，在合同当事人之间产生债权变动，以及从债权的转移，并产生让与合同之债。
The effect of the transfer of contract is to make the change of creditor's right between two parties of contract and from the assignment of credit, the debt of the transfer contract arises.
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