roaming是什么意思

roaming 英[?r?m?] 美[?ro?m?] v. 漫步; 随便走( roam的现在分词 ); 眼睛或手 （缓慢地）扫遍; 摸遍; [例句]international roaming is your digital mobile phone's passport to travel but the cost of calls is high.国际漫游服务可使数字手机在全球畅通无阻，但话费却很高。