He estimate his income tax bill by extrapolation from figures submit in previous year.

他从前几年的报税数字推算出自己应缴的所得税数额。

Using Doppler radar data, an algorithm for precipitation nowcast is set up by applying an improved cross-correlation extrapolation method (COTREC).

摘要利用多普勒雷达资料，采用一种的交叉相关法(COTREC)建立了一种降水临预报方法。