The teaching has the law, but indefinite method.
教学有法，但无定法。
But the complexity of the problem, the indefinite of the factors and especially the limits of the predicting method made large error between the prediction value and the reality.
但由于问题本身的复杂性、影响因素的不确切性、特别是预测方法的局限性，使得目前需水预测误差较大。
Indefinite art is not only an important feature of literature but also an important method of ancient poetry creations.
模糊艺术是文学艺术的重要特征之一，也是古代诗词创作的一个重要方法。
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