不久，癌症发病率比全国水平高出数倍。
Soon after, cancer rates rise to several times the national average.
WCRF说道有机食品并不比无机食品更能减低癌症发病率。
Organic food is no more likely to reduce the risk of cancer than non-organic produce, says the WCRF.
其分析计算结果基于美国体育锻炼数据和癌症发病率统计数据。
Calculations are based on U. s. physical activity data and cancer incidence statistics.
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