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 _    _    _    _              _    _     ______  
| |  | || | || | ||   ____    | || | ||  /_____// 
| |/\| || | || | ||  |    \\  | || | ||  `____ `  
|  /\  || | \\_/ ||  | [] ||  | \\_/ ||  /___//   
|_// \_||  \____//   |  __//   \____//   `__ `    
`-`   `-`   `---`    |_|`-`     `---`    /_//     
                     `-`                 `-`

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發送短信 : Spin Currents in a Coherent Exciton Gas