The PCA algorithm USES the "feature-face" approach to achieve the purpose of face detection, which determines whether it belongs to the face according to the "face space" the distance of the sample.

后者是利用了“特征脸”的方法，根据待识别样本到“脸空间”的距离确定它是否属于人脸，以此达到检测人脸的目的。

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Living in space stations seems to be fun, but astronauts face many problems.

生活在空间站似乎很有趣，但宇航员面临许多问题。

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The astronauts, climbing hand over hand along the face of the Space Station, worked their way to the motor.

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Instead, two pistons face each other and the space between them serves as the combustion chamber.

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Then, in 1961, a young cosmonaut named Yuri Gagarin lent his human face to a new extraterrestrial space era that threatened to leave the U.S. behind.

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