There is always an uncertainty in any measurement that you do.
误差总是存在，在任何测量中。
So whenever you make a measurement you must know the uncertainty.
所以在我们测量之前,一定要先了解不确定度。
Any measurement that you make without any knowledge of the uncertainty is meaningless.
如果不考虑不确定性，那么什么测量，都是没有意义的。
The uncertainty is an important index for measurement quality.
不确定度是测量质量的重要指标。
The uncertainty is an important index for measurement quality.
不确定度是测量质量的重要指标。
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