答：钍钨极仍是直流焊最常用的钨电极。但许多人开始避而远之，因为该元素具有放射性。
A: They remain the most common tungsten used in DC applications, but many people are starting to shy away because of the element's radioactivity.
答：钍钨极仍是直流焊最常用的钨电极。但许多人开始避而远之，因为该元素具有放射性。
A: They remain the most common tungsten used in DC applications, but many people are starting to shy away because of the element's radioactivity.
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