Then it was put on overland company stage coaches light wagons pulled by four or six horses.

VOA: special.2009.05.28

1 So, it's two times 3.12 plus four times 1.31, 6 all divided by six.

就是2*3。12+4*1。,最后再除以。

麻省理工公开课 - 固态化学导论课程节选

So, initially they came up with four lines and then eventually five and even six, and then they went back to five by the fifteenth century.

那么,他们最初提出的是四条线,但是最终却是五条线,甚至六条线,然后在十五世纪又回到了五条线

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