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.
它现在是植物生理学者一个标准工具为植物水潜力的领域和实验室测量。
It is now a standard tool of plant physiologists for both field and laboratory measurements of plant water potential.
测量与补偿器是一个标准的ASTM标准测试程序2，是一种特别有效的工具，实验室的质量控制明确塑料工业。
Measuring with a compensator is a standard ASTM test procedure 2 and is a particularly effective laboratory tool for quality control of clear plastics.
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