以下为句子列表：
英文: Abstract: In this paper, the requirements of passive leak detection of spacecraf t are analyzed, several dominant methods of passive leak detection in common are reviewed, their advantage, disadvantage and technique state are pointed out.
中文: 文摘:分析了航天器被动检漏的具体要求，对常用几种主要被动检漏方法进行了评述，指出了各种被动检漏方法的优、缺点和技术状态。
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英文: Alongside conventional test procedures like water bubble test and the differential pressure test, our particular speciality is the leak detection by means of carrier gas, where our principle focus is on Helium leak detection.
中文: 在传统的诸如水泡测试法和压差测试法之外，我们的特殊专长是用气体载体--氦气--来发现泄漏。
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英文: Finally, in view of the requirements of passive leak detection of Chinese space craft, the correlative steps are recommended.
中文: 最后，针对我国航天器的被动检漏需求，推荐了航天器被动检漏的相关措施。
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英文: NASA tested ultrasonic leak detection devices in the years 1990 to 1992.
中文: 美国航空航天局(NASA)于1990至1992年鉴定并通过了使用超声波泄漏侦测技术。
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英文: Seiler Vakuumtechnik GmbH is a manufacturer of Helium leak detection systems and special–purpose equipment.
中文: 赛乐真空技术有限责任公司是氦检漏系统和专用设备的制造厂家。
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