crawler
/ˈkrɔːlə(r)/noun
1
- a thing that crawls or moves at a slow pace, especially an insect or a slow-moving vehicle爬行（或缓慢行进）的东西（尤指昆虫或缓慢移动的车辆）。
1.1
- a tractor or other vehicle moving on an endless caterpillar track履带拖拉机; 履带式车辆。
1.2
- Computing a program that searches the World Wide Web, typically in order to create an index of data【计算机】爬虫程序。
2
- 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。