The teeth should be of good size, with the lower incisors fitting closely behind the upper incisors; a very slight space not to be regarded as a serious fault.

牙齿形状应该好，下门牙应紧贴上门牙的后部，非常微小的空隙不会被认为是严重缺陷。

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When the objective matters are studied by models, the forecasting results obtained by perfect fitting will not necessarily be very good. In this paper, the causes of error produced are analyzed.

借助于模型研究客观事物时，好的拟合得到的预测不一定很好，本文分析了产生误差的原因。

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