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
字机和油印机一样，随处可见。
Before the 1970s the slide rule, or slipstick, was as common as the typewriter or the mimeograph machine.
1970年代之前，计算字机和油印机一样，随处可见。
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不代表本软件的观点；若发现问题，欢迎向我们指正。
