与人类相似的雄性和雌性小鼠不仅性别是不同的，它们各自的遗传反应往往会得到与人们期待相反的药理学结果。
Like their human counterparts, male and female mice are not only different, their respective genetic responses can often be the reverse of what you'd expect from pharmacological results.
PGD适用于特殊遗传病的筛查，如囊性纤维化和神经节苷脂病，而且PGD也可以用于性别选择。
PGD is good for screening for specific genetic disorders such as cystic fibrosis and Tay-Sachs disease, and also can be used to select gender.
遗传，年龄，性别(女性)，怀孕，肥胖和长期站立等影响因素可能会增加静脉曲张的风险。
Factors such as genetics, age, female gender, pregnancy, obesity, and prolonged periods of standing may increase the risk for varicose veins.
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