[天]
equation of equal altitude
... equalizing regulation 均衡调节 equation of equal altitude 等高差 equation of light 光[行时]差 ...
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短语
高阶等差级数
[数]
arithmetic series of higher order
超人差等高仪
[天]
impersonal astrolabe
相邻两等高线的高度差
contour interval
高阶等差数列
arithmetic progression of higher order
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