To be effective, we need more epidemiological studies.
为了使预防更有效，需要更多流行病学研究。
But the most comprehensive data would be from some of the large epidemiological studies.
但是，最复杂的数据可能来自大量的流行病研究。
Epidemiological studies report that regular physical activity can reduce the risk for cancer development.
许多流行病学的研究都显示运动能减少肿瘤发生的风险。
Epidemiological studies report that regular physical activity can reduce the risk for cancer development.
许多流行病学的研究都显示运动能减少肿瘤发生的风险。
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