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1)
#5,944

Inflections of 追跡

Common
Meaning
    1. chase; pursuit; tracking; stalking
      The policeman chased the thief.
    2. following up; tracing
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3)
#61,865

Inflections of 追跡調査

ちょ
Meaning
    1. follow-up survey; tracing survey
    2. contact tracing (of an infectious disease)
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