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。
Trimethylamine is a kind of malodorous compound which possesses the speciality of excessive emission and low threshold concentration.
其中三甲胺是排放量大、嗅阈值低的恶臭污染物，是恶臭污染控制的主要对象之一。
When water content decreases, the concentration of 4-cba in liquid phase and solid phase tends to reduce, but it has a threshold value under which the influence o...
含水量的减小有利于固相和液相中4 - CBA浓度的降低，但此含水量存在一个阈值，低于此含水量对杂质的减少速率影响微小。
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