He says the average faces could also be used with existing face recognition technology for use, say, at airports for example.

他说，这些平均面孔也可以用于现有的人脸识别技术，比如说，可以用于机场。

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This decision also implies that the system will be used to complement, rather than replace, existing face-to-face lectures.

这种决定还暗示着，该系统将用于补充而不是取代现有的面授课堂。

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The existing face detection methods can be classified into four categories: Knowledge-based methods, Feature invariant approaches, Template matching methods and Appearance-based methods.

现有的静止图像人脸检测算法主要有四类：基于知识的方法、基于特征不变量的方法、基于模板匹配的方法和基于表象的方法。

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But, for some Facebook users, the existing face-detection feature is either unwanted or unworkable.

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Construction of new shopping centers is minimal, meaning that existing properties face little new competition.

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Even if these medicines get to market, it seems unlikely that they will replace the sales that Wyeth will lose as existing blockbusters face generic competition, according to Barbara Ryan, the pharmaceuticals analyst at Deutsche Bank.

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