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

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發送短信 : Effect of shearing rate on the behavior of sand