أرسل هذا في رسالة قصيرة: 最小安全间距约束下拥挤交通流速度-密度关系模型 = Speed-density relation model of congested traffic flow under minimum safety distance constraint

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