gēn​zōng HSK7

to tail

跟踪 跟蹤 gēn//zōng
to tail verb
to follow someone's tracks; to shadow or stalk somebody for surveillance or pursuit

Your wife's been following me.

to follow up verb
to provide continuous monitoring or follow-up service (e.g., in journalism or business contexts)

However, manually keeping track of water usage is nearly impossible.

Frequency

Movie subtitles
67.0 per million appears in 19% of films
Written text
21.6 per million

Details

HSK 2.0
Level 6
HSK 3.0
Level 7

Sources