(2) 对主要变例部分(或附近)的线路作延伸，例如单步延伸(Singular Extension)，深蓝(Deep Blue)及其前身就用这个方法，如果一个局面的某个着法远比其他着法好，就延伸这个着法。
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Unlike the Primary School, however, the ceiling of the Extension was designed as a singular vault.
和小学不同的是，扩建校舍的天花板被设计成单独的拱顶。
The related proof of such a kind of discrete-time singular bilinear systems may be regarded as the extension of the normal discrete-time bilinear system.
对于这一类离散广义双线性系统有关理论的证明，可以看作是正常离散广义双线性系统的拓广。
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