The interior of the tube is highly evacuated.
管内被抽成高真空。
Each evacuated tube consists of two layers of glass tubes.
每个真空管组成，两层玻璃管道得情况。
A highly evacuated electron tube containing an anode, a cathode, and a control grid.
三极管带有阳极，阴极和控制栅极的高真空的电子管
Study on the characteristics and applications of evacuated tube heated by trough concentration system
槽式聚光集热系统加热真空管的特性及应用研究
The annular space between the outer tube and inner tube is evacuated to virtually eliminate heat loss by conduction and convection.
而介于外管与内管的真空环状部分是用来减少热散失的。
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