In a laboratory vault outside Paris is a small cylinder of platinum-iridium alloy that serves as the standard for all mass measurements worldwide.
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.
在巴黎市外的一个实验室底下仓库里，有一个用铂-铱合金做成制成的小圆柱体，这就是全世界衡量重量的标准。
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。
The international prototype kilogram, the primary standard (see weights and measures) for weight, is made of an alloy comprising 90% platinum and 10% iridium.
国际标准质量千克的原型就是由90%铂和10%铱的合金制成的。
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。
A mineral that is a natural alloy of osmium and iridium with small inclusions of platinum, rhodium, and other metals, used in needles and wearing points.
铱锇矿一种矿石，是少量铂、铑及其他金属矿石的铱锇的自然合金，用于制造针头和耐磨尖端。
A mineral that is a natural alloy of osmium and iridium with small inclusions of platinum, rhodium, and other metals, used in needles and wearing points.
铱锇矿一种矿石，是少量铂、铑及其他金属矿石的铱锇的自然合金，用于制造针头和耐磨尖端。
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