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。
Orthogonal polynomial approximation is proposed to estimate the nonlinear deterministic trend and then the residual is used to test the unit root.
利用非线性逐步回归方法作台风活动趋势的预报。
The nonlinear stepwise regression method is used to make typhoon activity tendency forecast.
最后对非线性化学研究进展趋势进行了预测。
At last the trend of development of study on nonlinear chemistry was predicted.
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