The advandage of this method is fast detection and small blind spot.
该方法的显著特点是检测速度快、检测盲区小。
Heard such a story: in a large garden has a small house, the house is home to a blind person.
听到过这样一个故事：在一个大花园里有一间小屋子，屋子里住着一个盲人。
Some blind people can tell light from dark; others also have a small amount of vision.
某些盲人可以分辨出黑暗中的光亮，另外一部分盲人可以有少部分视觉。
Some blind people can tell light from dark; others also have a small amount of vision.
某些盲人可以分辨出黑暗中的光亮，另外一部分盲人可以有少部分视觉。
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