建立GM（1，1）灰色拓扑模型群，通过结论分析，表明该模型在年径流预报中为一种较为理想的方法。

Setting up GM(1,1) grey topological model groups and through analyzing conclusion, it indicates that such model is a kind of comparatively ideal method in predicting annual surface flow.

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虽然几代地学工作者的理想和不懈的追求，期望能给出一次明确的预报，但现在我们离这个目标还远。

Although generations of geologists have been striving for providing definitive forecast, we are still far away from the goal.

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雷达测雨的误差以及水文模型自身的结构和尺度问题等的复杂性，导致了水文预报的精度不理想。

The errors of radar rainfall measurement and the complexity of hydrological model have led to lowed accuracy for hydrological prediction.

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