These definitions form the basis for derivation set tracing. At the same time, they are the criterion for verifying the result of tracing.
这些定义和概念是跟踪起源集的基础，也是检验跟踪结果的依据。
These definitions form the basis for derivation set tracing. At the same time, they are the criterion for verifying the result of tracing.
这些定义和概念是跟踪起源集的基础，也是检验跟踪结果的依据。
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