Until recently most astronomers believed that the space between the galaxies in our universe was a near-perfect vacuum.
直到最近，大多数天文学家都认为我们宇宙中星系之间的空间是近乎完美的真空。
But low-Earth orbit isn't a perfect vacuum.
但近地球轨道不是一个完美的的真空。
In contrast to the mechanism of conduction and convection , radiation may take place in a perfect vacuum.
与传导和对流的原理不同，辐射可在完全真空中进行。
Vacuum may be thought of as the absence of pressure. It is the measure of negative pressure between standardized atmospheric pressure and a theoretically perfect vacuum.
真空可以被认为缺少压力。真空是以标准大气压的负压和理论完全真空来测量的。
Combined with our Vacuum Chambers and Central Filter Units we can create the perfect system for you.
真空室和中央过滤装置结合，可以为您创建完美的系统。
The so-called no perfect technology, vacuum freeze drying technology of the main disadvantages of high cost.
正所谓没有完美的技术，真空冷冻干燥技术的主要缺点是成本高。
The results of the experiment show that it is a type of perfect mine high-voltage vacuum distribution equipment, which is of high quality in its performance, protection and use.
试验结果表明该装置性能优良、保护齐全、使用方便，是煤矿井下理想的高压真空配电装置。
Features: Fashionable design, a strong suction vacuum cleaner motor supports long uninterrupted operation. Perfect sound insulation is suitable for noise-sensitive area cleaning.
外观设计超前时尚，吸力强劲的进口吸尘电机使得它得以长时间不间断操作，完美的隔音设计，最能适应对噪音敏感区域的清洁。
It's the perfect excuse to unplug the vacuum and abandon the washing up - housework can actually be bad for your health, according to research published earlier this year.
拔掉吸尘器的插头，丢开脏碗碟有了完美的理由——今年早些时候发表的研究称，家务活实际上对健康有害。
It's the perfect excuse to unplug the vacuum and abandon the washing up - housework can actually be bad for your health, according to research published earlier this year.
拔掉吸尘器的插头，丢开脏碗碟有了完美的理由——今年早些时候发表的研究称，家务活实际上对健康有害。
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