translation.en: You may be surprised to know that mammography is the only radiologic study that's regulated by federal law, and the law requires that the equivalent of a 40-pound car battery come down on your breast during this study.
translation.zh: 你也许会很惊讶， 乳房X光造影 是唯一被联邦法律允许的放射性研究技术， 法律要求 其强度约等于一块40磅的汽车电池 砸向你的乳房。