But for most scientific uses, you only need the first forty or so.

但一般的科学应用只需要小数点后约 40 位就行了。

It was in 1862 that, in spite of the Southern Members of Congress, who wished a more southerly route, it was decided to lay the road between the forty–first and forty–second parallels.

1862年，尽管有南方的议员反对，结果还是选定了在北纬四十一度和四十二度之间的地区修了这条铁路，而南方议员则要求铁路建筑得更靠南部一些。