So how do we go about measuring these things and what sorts of errors are in them, and how accurate are they?

那么我们该如何去评估,其中产生怎样的误差,它们又准确到什么程度

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When we measure EKG's, what we're measuring is the activity of all these cells within our heart performing action potentials.

当我们做心电图的时候,我们所测量的是心脏内能发出,动作电位的细胞的活动状态

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And many people rightfully so questioned the veracity, the value of these questionnaires, because it is subjective-- ? are we measuring something real?

很多人置疑问卷的，真实性和价值，因为它是主观的-,我们是在测量真实的东西吗？

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