虽然现有化学制剂颇受争议，但癌症控制可能还是需要化学预防。
Cancer control efforts might also need to include chemoprevention, though currently available agents are controversial.
我们现在看到有证据表明，大规模预防性化学疗法战略可以阻断传播。
We are now seeing evidence that the strategy of mass preventive chemotherapy can interrupt transmission.
他们含有预防癌症和心脏病的化学精神。
How? They contain chemicals that prevent cancer and heart disease.
他们含有预防癌症和心脏病的化学精神。
How? They contain chemicals that prevent cancer and heart disease.
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