很實用喔
http://www.peopo.org/portal.php?op=viewPost&articleId=6305
http://coswas.org/archives/01coswas/6essay/post_71.html
http://www.peopo.org/portal.php?op=viewPost&articleId=6305
http://coswas.org/archives/01coswas/6essay/post_71.html
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