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専門, せんもん
1. speciality, specialty, special subject of study, area of expertise, (one's) field, (one's) major
2. sole interest, single focus, concentrating exclusively on, doing exclusively, sticking to
专门
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中世, ちゅうせい
1. Middle Ages (in Japan esp. the Kamakura and Muromachi periods), medieval times, mediaeval times
tbd