Feature extraction is one of the key problems in pattern recognition system.

特征提取是模式识别中的一个关键问题。

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Precise facial feature points extraction is the key to solve these problems.

特征点精确定位是解决这些问题的关键。

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The recognition of underwater laser target is a new disquisitive field, in which many problems are open, and extraction is the key problem.

激光水下目标的识别是一个崭新的研究领域，有许多问题亟待解决，其中目标提取问题是关键。

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Suncor has run into an extra rich piece of ore with a high coal component, he said, which caused problems in the extraction process.

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