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年代之前,计算尺机和油印机一样,随处可。
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