在每次约化后，余下的方程是保持对称和带状的。
After each reduction, the remaining equations remain symmetric and banded.
该方法的主要优点在于其迭代矩阵总保持对称正定。
The main advantage of the proposed method is: the iterative matrix is symmetric and positive definite at ea ch iteration.
而能够保持对称的胚胎很显然有较好的基因（当然也是要某些运气的成分）。
The embryo that can maintain it obviously has good genes (and also a certain amount of luck).
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