对不同的示踪剂，仅在颗粒数量上等效，在抽样概率上是不等效的。
With different tracers, they are equivalent only in the number of grain, but not equivalent in the sampling probability.
对不同的示踪剂，仅在颗粒数量上等效，在抽样概率上是不等效的。
With different tracers, they are equivalent only in the number of grain, but not equivalent in the sampling probability.
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