noun火车轨道;跑道,赛道;小路,小径;(动物或人的)足迹,踪迹,车辙;(磁带、CD 或唱片的)一首歌曲,一首乐曲;与…失去联系,不了解…的动态
verb跟踪,追踪;搜寻到,追踪到
nounthe metal lines that a train runs on
nouna special road for races
nouna rough path or road
nouna line of marks that an animal, a person or a vehicle makes on the ground
nounone song or piece of music
nounto not have information about what is happening or where somebody or something is
verbto follow signs or marks to find somebody or something
verbto find somebody or something after looking in several different places