直到最近这个比例都被认为是量子测量灵敏度的绝对极限。
Until recently it was thought that this scaling represented an absolute limit on the sensitivity of quantum measurements.
阳性细胞系DNA模板与反应增生性淋巴组织DNA按不同比例混合后扩增，检测降落式PCR的灵敏度。
The positive control cell line DNA was mixed in different proportions with the DNA extracted from reactive lymphoid tissue to test the sensitivity of the touch-down PCR.
为了获得有实用价值的灵敏度及特异度，在筛查阴性者中抽取一定比例样本进行诊断试验是必要的。
In order to obtain the sensitivity and the specificity, which are useful for practice, it is necessary that a subsample should be selected in the screened negative subjects for diagnoses.
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