The furnace employed for making "e" glass is of a type known as a Unit Melter.

用来制造“E”玻璃的窑是一种通称为单元窑的窑炉。

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But researchers have been stymied because not all the technetium-99 is incorporated into the glass and volatilized gas must be recycled back into the melter system.

但研究人员一直没有成功，因为不是所有的锝- 99都能纳入到玻璃容器中，挥发性气体也必须被回收到熔化系统里。

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