Being a primary phase of face recognition, vision point tracing, and face image compression etc., inspecting human face out from the image background is the very first step.
作为人脸识别的重要的第一步，人脸检测所做的工作是将人脸从图像背景中检测出来，它是人脸识别、视点跟踪和人脸图像压缩等应用中的重要环节。
Exercise 5: Move your eyes as far up and to the right as you can, find a point in your vision to focus on, count one breath.
练习5：把你的眼球从最上端尽量转向右边，在你的视野里找到一个点注视着它，深呼吸一次。
Removing the cataract will probably not correct all of the vision loss at this point.
若此时才摘除白内障，可能也无法挽回所损失的全部视力。
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