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 |  _ \\    / _ \\    / ___//  /_   _//  /_   _// 
 | |_| ||  / //\ \\   \___ \\   -| ||-     | ||   
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 `-` --`  `-`   `-` `-----`    `-----`   `--`

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發送短信 : Coherent transition radiation from short electron bunches