劳动的二重性 the duplex character of labour;dual character of labour; two-fold character of labour

商品生产的二重性 the dual nature of the production of commodities

二重听觉的 dichotic

曲线的二重点 double point of curve

结构的二重性 Duality of Structure

二重积分的计算 Evaluation for double integral ; Computation of Double Integral

爱的二重奏 Love Duet

二重透视的 doubly perspective

二重积分的概念 concept of double integration ; Concept of Double Integral