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正常的图片<br />
<img src="http://lh3.ggpht.com/_l8FcMjS-xnI/Sb3wh8kSk6I/AAAAAAAAExc/DMUyic7Odas/screenshot_003.jpg" /> <br />
添加透明之后<br />
<img style="filter:alpha(opacity=100);" src="http://lh3.ggpht.com/_l8FcMjS-xnI/Sb3wh8kSk6I/AAAAAAAAExc/DMUyic7Odas/screenshot_003.jpg"  />
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