text_1: 假 阳性率 的 定义 为 MRI 筛查 结果 为 阳性 , 但 随后 发现 未患 乳腺癌 的 女性 百分比 .
  
text_2: the false positive rate was defined as the percentage of women who had a positive result on screening MRI but who were later found not to have breast cancer .
  