在天体测量和天体物理观测中用作参考标准的恒星。
利用的定标星越多，计算的精确度就越高。
The calculation becomes more accurate if more reference stars are used.
在昨天发布的报告当中，美国国家医学院提出了一个解决方案：简单说来，就是给食品设定标准化评级-在每个食品的包装袋上标上0颗到3颗星或者审核标记。
The Institute of Medicine offered a possible solution in a report released yesterday: put a simple, standardized rating—zero to three stars or checkmarks—on every food package.
随着合成孔径雷达(SAR)图像定量应用的日益广泛和深入，定标已成为现代星载SAR遥感测量的必备技术条件。
With the increasingly extensive and in-depth application of quantitative Synthetic Aperture Radar (SAR) images, SAR calibration became a necessary technique in modern spaceborne SAR remote sensing.
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