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 |  _ \\    / _ \\   / ____||   / _ \\      ___   
 | |_| ||  / //\ \\ / //---`'  / //\ \\    /   || 
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 `-` --`  `-`   `-`   `----`  `-`   `-`     -|_|| 
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發送短信 : Energy harvesting using piezoelectric materials