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+ 柱樑 柱梁 [zhu4 liang2] /pillar/

+ 衝撞 冲撞 [chong1 chuang2] /to dash against/to batter/

+ 攻城木 攻城木 [gong1 cheng2 mu4] /battering ram/

+ 攻城 攻城 [gong1 cheng2] /to besiege (a town)/

+ 梁木 梁木 [liang2 mu4] /beam/rafter/lintel/person able to bear heavy responsibility/mainstay (of organisation)/pillar (of state)/

+ 縱向 纵向 [zong1 xiang4] /longitudinal/

+ 駁斥 驳斥 [bo2 chi4] /to refute/to debunk/to deny/to denounce/

+ 不受約束 不受约束 [bu4 shou4 yue1 shu4] /unrestricted/

+ 受約束 受约束 [shou4 yue1 shu4] /unrestricted/

+ 趨 趋 [qu1] /to hasten/to hurry/walk fast/to approach/to tend towards/to converge/

+ 趨近 趋近 [qu1 jin4] /to approach (a numerical value)/to converge to a limit (in calculus)/convergence/

+ 反函數 反函数 [fan3 han2 shu4] /inverse function (math.)/

+ 極坐標 极坐标 [ji2 zuo4 biao1] /polar coordinates (math.)/

+ 隱函數 隐函数 [yin3 han2 shu4] /implicit function/

+ 花費 花费 [hua1 fei4] /expense/cost/to spend (time or money)/expenditure/

+ 增量 增量 [zeng1 liang4] /increment/

+ 導函數 导函数 [dao3 han2 shu4] /derived function/derivative f' of a function f/

+ 表達式 表达式 [biao3 da2 shi4] /expression (math.)/displayed formula/

+ 動點 动点 [dong4 dian3] /moving point/

+ 割線 割线 [ge1 xian4] /line interval/secant/