青云翻译

Since adding a certain amount of thorium oxide, so that the shortcomings of the pure tungsten can be overcome, but there are traces of radioactive

Because adding a certain amount of thorium oxide, to overcome these disadvantages of pure tungsten, but trace radioactive

Because has joined certain thoria, enables the above pure tungstic electrode the shortcoming to overcome, but has the trace-level activity

Because of the inclusion of a pure tungsten oxide, so that the above was very shortcomings could be overcome, but there is a weakly radioactive

Because adding a certain amount of thorium oxide, to overcome these disadvantages of pure tungsten, but trace radioactive