A Comment on Significant Digits

关于有效数字的评论

No measurements are exact, and it is important to state experimental results with a number of significant digits which give a reasonable impression of the accuracy of the measurement. Consider the following example of a measured density.

没有测量是完全精确的，因此必须用适当的有效数字来表述实验结果，以合理地反映测量的准确性。考虑以下关于测量密度的例子。