發送短信 : Probability distribution of bed particle instability

  _  __    ______   _    _      ___     ______   
 | |/ //  /_   _// | || | ||   / _ \\  |      \\ 
 | ' //    -| ||-  | || | ||  | / \ || |  --  // 
 | . \\    _| ||_  | \\_/ ||  | \_/ || |  --  \\ 
 |_|\_\\  /_____//  \____//    \___//  |______// 
 `-` --`  `-----`    `---`     `---`   `------`