| 囲碁三級 | third rank in the game of go |
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| 丑三つ時 | dead of night, middle of the night, midnight |
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| 三悪趣 | the world of hungry spirits and the world of animals, three evil worlds hell |
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| 三岐代表 | representative of Gifu and Mie prefectures |
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| 三国志 | Annals of the Three Kingdoms |
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| 三蔵 | three branches of Buddhist sutras |
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| 三尊仏 | image of the three honorable (honourable) ones |
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| 三度の和音 | common chord, triad |
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| 三眠蚕 | three-molt silkworm |
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| 正三位 | senior grade of the third court rank |
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| 従三位 | second grade of the third rank of honor (honour) |
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| 大砲三門 | three cannons |
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| 第三種郵便物 | third-class mail matter, (item sent by) third-class mail |
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| 奪三振 | striking a batter out |
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| 三柱の神 | the three main gods: Amaterasu Omikami, Tsukuyomi no Mikoto and Susano-o no Mikoto, three precious children |
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| 三軸 | triaxial |
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| 三軸圧縮試験 | triaxial compression test |
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| 三軸圧縮試験機 | triaxial compression apparatus |
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| 三軸試験 | triaxial test |
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| 三軸室 | triaxial cell |
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| 三十 | thirty |
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| 三国人 | foreigner resident in Japan (esp. Chinese and Korean) |
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| 三悪道 | the world of hungry spirits and the world of animals, three evil worlds hell |
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| 三分の一 | one third, a third part |
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| 三和音 | triad |
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| 第三次 | the third ..., tertiary |
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アデノシン三リン酸
アデノシン三燐酸 | adenosine triphosphate, ATP |
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| グアノシン三燐酸 | guanosine triphosphate, GTP |
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| 鋭角三角形 | acute triangle |
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| 三本立て映画 | triple feature (movie) |
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| 週三日 | three days a week |
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| 第三者割当増資 | third-party allocation of shares |
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| 第三政党 | third party |
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| 三言 | three words |
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| 三項演算子 | ternary operator, conditional operator |
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三つ巴の戦い
三つどもえの戦い | playoff for the tournament win with three wrestlers participating |
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| 三つ巴戦 | playoff for the tournament win with three wrestlers participating |
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| 結びの三番 | final three bouts of the tournament day |
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| これより三役 | final three bouts on the last day of a tournament |
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| 三賞 | three special awards for wrestlers at the end of a tournament |
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| 三段目格 | referee officiating the third lowest sumo division |
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| 三役揃い踏み | ritual stomping in unison on the final day of a tournament |
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| 三番稽古 | a row of training matches with the same opponent |
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