因此，在第一个目录域输入x： \ english，然后按enter键，表示启动从english子目录开始的搜索。

So entering x: \ English in the first directory field and pressing enter will initiate a search starting from the English subdirectory.

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针对模型信赖域方法中搜索方向存在的不足，提出了按负曲率方向进行搜索的模型信赖域算法，并证明了算法的收敛性。

Aiming at the shortcomings of trust region method, we proposed an algorithm using negative curvature direction as its searching direction. The convergence of the algorithm was given.

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