地图的信息可分为直接信息和间接信息。
Information of a map can be divided into direct information and indirect information.
间接信息不是来自符号本身，要通过分析间接获得。
Indirect information is not from symbol itself but from analysis indirectly.
由于隐伏矿找矿失去了矿产的直接信息，只能依靠深部探测的方法、技术，得到间接信息。
There is no direct information, only indirect information depended on the methods and technologies for prospecting concealed ores could explore in the deep.
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