人脸识别是一项极富挑战性的课题。

Human face recognition is a challenging issue.

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其中极富挑战性的观点则是生物进化是通过自然选择实现的。

And the challenge was the theory of evolution by natural selection.

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这将很艰难，因为正如我所说过的这是一条极富挑战性的赛道。

It will be tough, because, as I said this is a very challenging circuit, which is difficult from the physical point of view.

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