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
，
可
。
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，可。
声
：
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