使用两个样本点，计算计数器的效能资料。
Calculates the performance data of the counter, using two sample points.
接下来，科学家对DNA样本中称为位点的13至15个区域的串联重复或两个以及多于两个核苷酸的重复进行观察。
Next, scientists look at tandem repeats, or the repeat of two or more nucleotides, in roughly 13 to 15 regions of a DNA sample called loci.
世界卫生组织和英格兰和他的同事在英国利物浦大学，路易斯·奎瓦斯采取两个“点”的样本，在门诊相隔一个小时，而第三个第二天。
Luis Cuevas of the World Health Organization and the University of Liverpool in England and colleagues, taking two "spot" samples in the clinic an hour apart, and a third one the next day.
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