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専門分野 (せんもんぶんや) — area of expertise; (one's) field; (one's) line
専門分野
area of expertise
専門 せんもん
speciality; specialty; special subject of study; area of expertise; (one's) field; (one's) major
専門的 せんもんてき
technical; specialist; professional; exclusive
専門家 せんもんか
specialist; expert; professional; authority; pundit
専門性 せんもんせい
specialization; specialty; speciality; expertise
専門化 せんもんか
specialization; specialisation