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+ 雙曲 双曲 [shuang1 qu1] /hyperbola/hyperbolic (function)/

+ 單葉雙曲面 单叶双曲面 [dan1 ye4 shuang1 qu1 mian4] /hyperboloid of one sheet (math.)/

+ 雙曲拋物面 双曲抛物面 [shuang1 qu1 pao1 wu4 mian4] /hyperbolic paraboloid (math.)/

+ 雙曲餘割 双曲余割 [shuang1 qu1 yu2 ge1] /hyperbolic cosecant, i.e. function cosech(x)/

+ 雙曲拱橋 双曲拱桥 [shuang1 qu1 gong3 qiao2] /double arched bridge/

+ 反射面 反射面 [fan3 she4 mian4] /reflecting surface/

+ 反光面 反光面 [fan3 guang1 mian4] /reflecting surface/

+ 反光 反光 [fan3 guang1] /to reflect light/

+ 定直線 定直线 [ding4 zhi2 xian4] /directrix of a parabola/

+ 準線 准线 [zhun3 xian4] /directrix line of a parabola/guide line/

+ 框 框 [kuang4] /frame (e.g. door frame)/casing/fig. framework/template/to circle (i.e. draw a circle around sth)/to frame/to restrict/

+ 框架 框架 [kuang4 jia4] /frame/framework/fig. pattern/outline/organizing plan/

+ 框框 框框 [kuang4 kuang4] /to frame/to circle/pattern/convention/restriction/

+ 模似 模似 [mo2 si4] /to simulate/to emulate/

+ 門邊框 门边框 [men2 bian1 kuang4] /door frame/door pillars/

+ 框圖 框图 [kuang4 tu2] /flowchart/block diagram/

+ 方框圖 方框图 [fang1 kuang4 tu2] /flowchart/block diagram/

+ 合取 合取 [he2 qu3] /connective/conjunction/

+ 訛字 讹字 [e2 zi4] /erroneous character/typographical error/

+ 捙 捙 [yi4] /erroneous variant of 拽[ye4]/

+ 條條框框 条条框框 [tiao2 tiao2 kuang4 kuang4] /fixed framework (成语 saw); restriction of social conventions and taboos (usually derogatory)/regulations and restrictions/