a thing that crawls or moves at a slow pace, especially an insect or a slow-moving vehicle 爬行物;(尤指昆虫或车辆等)缓速前进物 ■a tractor or other vehicle moving on an endless caterpillar track 履带拖拉机;履带式车辆 ■(Computing)a program that searches the World Wide Web, typically in order to create an index of data (计算机)机器人;蜘蛛(一种搜索万维网以建立数据库的程序)
(Brit. informal)a person who behaves obsequiously in the hope of advantage or advancement (英.,非正式)卑躬屈膝者;谄媚奉承者