Two birds
Teacher：Here are two birds, I shot with the thumb camera, one is the swallow, the other is the sparrow, Now who can tell us which is which?
Student: I cannot point out but I know the answer, because I had such car in a camera captured the birds.
Teacher: Please tell us
Student: Then I use the USB camera find to which is which , finally I found the swallow is beside the sparrow and the sparrow is beside the swallow.
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