100米比赛排名,const 类型说明符 &引用名 ，常引用：不能通过常引用更新所引用的对象，如果用常引用作形参，便不会意外地发生对实参的更改。-100 meters race rankings, const type specifier &　quoted name, often cited: to cite the update can not be invoked by the object, if often cited as shape parameters, it would not have happened accidentally Participation real changes.