• 多年来,长度科学标准曾是金属,这根金属保存巴黎附近的有温度调节的地下室里。

    For many years, the scientific standard of length was a metal bar kept in a temperature controlled vault near Paris.

    youdao

  • 多年来,长度科学标准曾是金属,这根金属保存巴黎附近的有温度调节的地下室里。

    For many years, the scientific standard of length was a metal bar kept in a temperature controlled vault near Paris.

    youdao

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