Face recognition often meet these problems, the dimension of sample too high, the classes of pattern too Mach and each person could only provide a small amount training sample.
人脸识别过程中会遇到各种问题，其中样本维数过高、类别数大、单人训练样本少以及识别的实时性都是亟待解决的难题。
The drugs that are available are mach too expensive.
那些有效的药物价格太高。
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