Before the 1970s the slide rule, or slipstick, was as common as the typewriter or the mimeograph machine.
1970年
之前，
尺跟打字机和油印机一样，随处可
。
尺Before the 1970s the slide rule, or slipstick, was as common as the typewriter or the mimeograph machine.
1970年之前，尺跟打字机和油印机一样，随处可。
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