Now I know it feels counterintuitive not to show all of the numbers that you have at your fingertips, but you've got to realize: all of those numbers beyond the number of sig figs you have? They're lies.
但是0很怪,因为有时只是个占位的符号 比如说:最快的飞机可以达到时速13,000英哩, 顺带一提,它真的可以!