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Zoom in image :press the key to enter, press it again to quit.
By two fingers move outward and inward on the touch screen to zoom in and out the image. When the
image is enlarged, click left, right, upward and downward the image to view every detail.
When the image is enlarged, if not operate on touch screen, it can operate by the keyboard ,press the
key to zoon in , press the key to zoom out ,press upward and downward key to move
image .
