1. Before the 1970s the slide rule, or slipstick, was as common as the typewriter or the mimeograph machine.

 

　　1970年代之前，计算尺跟打字机和油印机一样，随处可见。

 

　　2. By the 1960s you could not graduate from engineering school without a week's instruction in the use of a slipstick.

 

　　1960年代，如果没上过一周计算尺使用课程，就不能从工学院毕业。