Data are rounded to three significant figures.

数据用三个有效数字表逹.

Answers are provided to about half the problems, and are rounded off to two or three significant figures.

大约一半的习题有答案，取二或三位有效数字。

Many historians regard Solon as one of the most significant figures in ancient Greek history.

许多历史学家认为梭伦是古希腊历史上最重要的人物之一。

Do not fabricate significant figures.

不要伪造有意义的外形？

Significant figures---all the digits known with certainty plus the first uncertain digit.

有效数据——实际能测得的数据，其最后一位是可疑的。