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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After comparing and analyzing existing face detection methods based on complexion, a skin model used to detect human faces in this thesis, Gaussian distribution model is proposed.

研究了常见的基于肤色的人脸检测算法并分析比较其优缺点，给出本文利用肤色特征进行肤色检测时所采用的肤色模型——高斯分布模型。

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

CNN: Why faces matter to Facebook

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

WSJ: Starwood Goes Shopping for U.S. Malls

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.

FORBES: Wyeth's Worries