All the women studied had regular menstrual cycles lasting 28 days or less , and none were taking hormonal contraceptives .
被调查的所有妇女月经都很正常,一般在28天或者28天不到,没有人服用激素避孕药。
Using contraceptives and abstinence are the best methods of preventing teen pregnancy .
使用避孕药以及禁欲是防止早孕的最好办法。
Some girls take contraceptives so they will not get their periods during the exam .
有些女生为了防止考试期间来例假就口服避孕药。
The role of hormones in breast cancer , including both postmenopausal hormone therapy and oral contraceptives , was not examined .
绝经后服用激素、避孕药等治疗乳腺癌的方法是否有益于健康,还没有经过验证。
Dutch parents like natalie 's talk to their children about sex and its unintended consequences and urge them to use contraceptives and practice safe sex .