It is important to avoid the use of uranium compounds of unspecified isotopic composition. 要避免使用那种非专用的同位素成份的铀化合物。
The conductivity imparted to the air can be ascribed to ionization produced by the rays emitted bythe uranium compounds. 空气的这种导电性可以看做是铀化合物放射出的射线产生电离的结果。