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- 子二代(简写F 2 )second filial generation
- 子二代鼠Physical development
- 子一代(简写F 1 )first filial generation
- 二two
- 近交子二代inbreeding two generation
- 子midnight
- 杂交子二代Second filial( F2 )
- 子二代（F2）second filial generation (F2)
- 帖子post
- 二号2nd day of the month
- 二楼second floor
- 周二Tuesday
- 二次adratic quadrate
- 二等second-class
- 大二学生sophister
- 小二young waiter in a wineshop or an inn
- 二代bibasic
- 文昌鱼的实验室繁育及子二代获得Laboratory Culturing and Acquirement of the Second Filial Generation of Amphioxus
- 轻子二重态lepton doublet
- 二代近帖聚焦像增强器纳秒响应技术Technology Study of ns Response for the Second Generation Proximity Focus Image Intensifier
