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定义
通过假设两个已知数据点之间存在某种函数关系（通常为线性），来估算中间值的方法。
解释
If water boils at 100°C at sea level (0 m) and at 93.3°C at 2,000 m altitude, linear interpolation gives a boiling point of 96.65°C at 1,000 m. Lookup tables in engineering handbooks use interpolation for intermediate values. Linear interpolation introduces errors when the true relationship is non-linear — at extreme altitudes, a quadratic fit is more accurate.
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