How many genes are now thought to increase breast cancer risk?
现在认为有多少基因能增加乳腺癌的发生几率？
It will take time for you and your baby to learn how to breast-feed.
这是需要时间，为您和您的婴孩，以了解如何哺乳。
European children learn the breast stroke; they often don't know how to crawl.
欧洲小孩学习蛙泳；他们经常不知道怎样进行自由式游泳。
"I'm tired of hearing how complicated breast cancer is," Brenner said.
“我已经厌倦了听证会多么复杂乳癌是，”布瑞尔说。
"I'm tired of hearing how complicated breast cancer is," Brenner said.
“我已经厌倦了听证会多么复杂乳癌是，”布瑞尔说。
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