New research suggests that the culprit may be an old villain—lead—and what's more it explains the causal pathway from exposure to disability.

最新的研究表明该元凶可能是一种古老的杀手——铅，而且铅解释了从暴露到残疾的因果途径。

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The second EPZ, called the ingestion exposure pathway zone, includes residents within a 50-mile-radius from the nuclear reactor.

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