hard vacuum meaning in English
高度真空
极高真空
Examples
- 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。 - In may , the team ran tests at lower temperatures but with harder vacuums as oxygen could be extracted with less power under this condition
研究小组在五月曾尝试在低温但高度真空的环境下进行实验，因为在这环境下，提取氧气所需的能量会较少。