From time to time, a class contains a core element of data from which the rest of the class's fields can be derived or retrieved.

很多情况下，类中包含一个核心数据元素，通过它可以派生或找到类中的其他字段。

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Using infrared data of Geostationary Meteorological Satellite, the gray scale and other kinds of element were calculated or derived after map projecting and geographic calibrating.

经过地理定位、地图投影后，读取了地球同步气象卫星红外灰度，计算了导出物理量。

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