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