求翻译：The example of applying a model described above demonstrated a scenario in which the model returned a positive result, i.e. predicted the presence of the target substance. Figure 13 shows the result of applying the same PCR Acetonitrile model to another test spectrum, which is the spectrum of a mixture of methanol and water, i.e. not containing acetonitrile. The Results pane in this example states that the model‘s target substance (acetonitrile) has not been detected.是什么意思？

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