The lower the radon concentration in a home, the lower the risk as there is no known threshold below which radon exposures carries no risk.

家中的氡浓度越低，风险也就越小，但尚不了解氡接触低于何浓度才无风险。

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By ensemble average method, the concentration distribution and error threshold of quasispecies on single peak Gaussian distributed fitness landscapes were evaluated.

利用系综平均的方法，计算了在单峰高斯分布适应面上准物种的浓度分布和误差阈。

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Results The cochlear blood flow and noise-induced level of temporary threshold shift were not affected by different concentration of Propranolol during noise exposure.

结果在噪声刺激期腹膜内注射不同浓度普萘洛尔，对耳蜗血流和噪声暂时性阈移无影响。

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Unfortunately, the Federal Trade Commission is unlikely to get involved in this case, because the market-concentration threshold they use in hospital-merger cases is too high.

FORBES: Goal of the NYU-Continuum Hospital Mega-Merger: Raising Prices