hard vacuum tube 高真空管
hard vacuum seal 强真空密封
hard-zinc vacuum furnace 硬锌真空炉
vacuum metal hard pipe 真空金属硬管
The interior of the tube must be kept a hard vacuum to preserve the photo cathode.
显象管内部一定要保证高真空才能保护光电阴极。
The Givin hail from the planet Yag'Dhul, a world with a complex moon system that often causes tidal upheavals exposing areas of Yag'Dhul to the hard vacuum of space.
吉文人来自亚格杜尔星（Yag'Dhul）。这颗行星有复杂的卫星系，经常如潮汐般引发地质隆起，把亚格杜尔星的某些区域暴露在真空的外层空间里。
Shooting a million miles or more out into the hard, cold vacuum of space, this fiery halo is one of the wonders of the universe.
炽烈的光晕向冰冷无情的太空抛出近百万公里，这是一出让人类望而生畏的宇宙奇观。
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