- 先天性 xiāntiānxìng innatenessthe quality of being innate or inherent; the state of being congenital
- 后天性 hòutiānxìng acquired; posterioritythe state of being acquired after birth rather than innate (e.g., traits, conditions, or characteristics)
- 先天性缺陷 xiāntiānxìngquēxiàn birth defecta physical or functional abnormality present at birth; congenital defect
- 先天性畸形 xiāntiānxìngjīxíng congenital malformationA physical deformity or birth defect present from birth, such as a cleft lip or extra digits; it may be caused by genetic factors, maternal malnutrition, or environmental influences.
- 后天性免疫 hòutiānxìngmiǎnyì acquired immunityThe defense capability of a vertebrate's body to produce antibodies after birth when stimulated by antigens or vaccines; also called [[获得性免疫|獲得性免疫|huo4 de2 xing4 mian3 yi4]] or [[适应性免疫|適應性免疫|shi4 ying4 xing4 mian3 yi4]]
- 先天性免疫 xiāntiānxìngmiǎnyì innate immunitythe non-specific defense mechanism that a living organism is born with to resist certain pathogens
- 父子天性 fùzǐtiānxìng father-son bondNatural bond or affection between a father and his son; the innate emotional connection between father and child.
