adj.被牵引的；跟踪的
动词trail的过去式和过去分词形式.
His voice trailed off in confusion. 困惑中他的声音逐渐变小
The horse I had backed trailed in last. 我下赌注的那匹马落在後面，跑了个倒数第一。
The tired children trailed along behind their parents. 孩子们累了，没精打采地跟在父母後面。
The bride's long skirt trailed along behind her. 新娘的长裙拖在身后。
