美国研究显示，生过小孩的妇女较能避免癌症。
US study shows that women who have borne children may be better protected from cancer.
美国研究显示，通过剖腹产出生的婴儿患呼吸道疾病的可能性较大。
U.S. studies have shown babies born by cesarean have a greater chance for respiratory problems.
一项美国研究显示，许多医生会向病人推荐他们自己绝不会使用的治疗方法。
Many doctors recommend treatments to their patients that they would not use themselves, a us study shows.
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