The name is a reference to International Prototypekilogram, as a base unit of mass in the International System of Units.
它的名字和国际单位中表示基本聚合物质质量千克有关。
2
The international prototypekilogram, 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。
3
It was then necessary to produce the two prototype standards (metre and kilogram) on to which the measurements would be copied for distribution across France.