在巴黎郊外的一个实验室地下室中，有一个铂铱合金作的圆筒，这个圆筒就是作为世界上所有质量测量的标准。
In a laboratory vault outside Paris is a small cylinder of platinum-iridium alloy that serves as the standard for all mass measurements worldwide.
巴黎城外的一个玻璃罩里存放着一个铂铱合金圆柱体，这个圆柱体就是全世界测量物体质量的参照标准。
In a laboratory vault outside Paris is a small cylinder of platinum - iridium alloy that serves as the standard for all mass measurements worldwide.
巴黎城外的一个玻璃罩里存放着一个铂铱合金圆柱体，这个圆柱体就是全世界测量物体质量的参照标准。
In a laboratory vault outside Paris is a small cylinder of platinum-iridium alloy that serves as the standard for all mass measurements worldwide.
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