机能性喉头软骨整形术-两型性Thyroid cartilage plasty-two types
二位整数two-digit integer【数】
一国两制One country, two systems
二分法twoway classification
对联poetic couplet: two successive rhyming lines in poetry
双侧导数bilateral derivative【数】;two-sided derivative【数】
双向电泳two-dimensional electrophoresis
两门轿车two-door sedan