o hit the trail 出发,立即走开 o in trail 成一列纵队地 off the trail 失去嗅迹[线索];迷失;[喻]出轨;离题 on the trail 寻找,找到嗅迹[线索] o on the trail of 跟踪追赶 o throw sb. off the trail 甩掉尾巴 trail after 追随 o trail off 变弱;逐渐消失 hit the trail 出发, 立即走开  in trail 成一列纵队地  off the trail 失去嗅迹[线索]; 迷失; [喻]出轨; 离题  on the trail 寻找, 找到嗅迹[线索]  on the trail of 跟踪追赶  throw sb. off the trail 甩掉尾巴  trail after 追随  trail off 变弱; 逐渐消失