sex gonad development 性腺发育
A time sex apply fertilizer 一次性施肥
a Web site selling sex 校园地理信息系统; 网站
Abnormal sex characteristics 性征异常; 中央处理机; 中央处理器
Abnormal sex differentiation 性分化异常
Abnormally high Sex Raxio at Birth 反向连接
accept the idea of pre-marital sex 接受婚前性行为
accessory sex gland 附性腺; 乙醛酶; 量规
accessory sex organ 附属性器官
accessory sex structures 副性结构
Age and sex 年龄及性别; 动态降噪
age-sex pyramid 年龄性别金字塔
age-sex specific death rate 年龄别性别死亡率
Age-sex structure 年龄性别结构
Alternative Splicing: Regulation of Sex Determination in Drosopbila meldnogaster 选择性剪接:隐杆秀丽线虫性决定的调节
anal sex 肛交
and sex behavior 性行为
are having unprotected sex 有不安全的性行为
attitude to sex 性态度