The fitted line in the figure is a 3rd-degree polynomial, but any sort of smoothing would tell you that there is a massive upward trend.
拟和线是一个三次多项式的形式，但是任何形式的平滑都会告诉你有一个大的上升趋势。
Trend term displacement is determined by the potential energy and constraint condition of the slope and is predicted by displacement polynomial function.
趋势项位移由边坡的势能和约束条件所决定，利用多项式位移函数进行拟合预测。
Orthogonal polynomial approximation is proposed to estimate the nonlinear deterministic trend and then the residual is used to test the unit root.
本文研究用正交多项式逼近非线性趋势，然后对残差进行单位根检验的方法。
The result was as follows: (1) The year trend of cotton aphid intimidated by natural enemy is pictured with a three cubed polynomial.
研究结果认为：(1)天敌胁迫下的棉蚜的年趋势可以用一个三次多项式来拟合。
The result was as follows: (1) The year trend of cotton aphid intimidated by natural enemy is pictured with a three cubed polynomial.
研究结果认为：(1)天敌胁迫下的棉蚜的年趋势可以用一个三次多项式来拟合。
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