return to reasonable levels
回归合理水平
以上为机器翻译结果，长、整句建议使用 人工翻译 。
However, after those two months, the situation in Japan needed to be re-evaluated and people allowed to return to most areas below reasonable radiation levels, levels in which many of us elsewhere in the world live.
FORBES: Fukushima -- Fear Is Still the Killer
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