跟踪 angolul

trail [trailed, trailing, trails]▼(follow behind)
verb
[UK: treɪl] [US: ˈtreɪl]

stalker [stalkers]▼(person who secretly follows someone, sometimes with unlawful intentions)
noun
[UK: ˈstɔːk.ə(r)] [US: ˈstɔːk.ər]