作为一项预防措施，科学家正在监测空气中放射性系数。
As a precaution scientists are monitoring radioactivity in the air.
作为一项预防措施，科学家正在监测空气中放射性系数。
As a precaution, scientists are monitoring radioactivity in the air.
工程实践表明，其具有导热系数小，绝热性优良、施工性能稳定、无毒无放射性污染等特点。
Engineering Practice shows that the coefficient of heat conduction small insulation of the fine, construction performance, stable, non-toxic and non-radioactive pollution characteristics.
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