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。
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。
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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