经分析认为，由于缺乏高性能的导热绝缘材料，目前所制作的空心阴极的冷却效果不是很好。
From the results the author thought that due to the lack of high quality insulator with high heat conductivity.
高性能的绝缘材料几乎无处不在，即使在原来的房子的墙里。
High performance insulation is everywhere, even in the walls of the original house.
高性能的绝缘材料几乎无处不在，即使在原来的房子的墙里。
High performance insulation is everywhere, even in the walls of the original house.
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