为了证明自己的设计有道理，安吉亚太空公司走了非同寻常的一步：在初步设计阶段，定制建设了试验性的推进系统。
To make its case, RKK Energia took the unusual step - at a preliminary design stage - of ordering the construction of an experimental propulsion system.
空心阴极是电推进系统可靠性和工作寿命关键部件，空心阴极研制在很大程度上依赖于阴极试验技术的支持。
Hollow cathodes are key assemblies of reliability and life for an electric propulsion system, and their developments are strongly depended on a series of tests.
中国宣布，它试验了一种先进的反导拦截系统。此举提醒人们，中国正在快速推进其军事能力的技术升级。
China says it has tested an advanced missile interception system, a move that serves as a reminder of the rapidly progressing technological upgrade of its military capabilities.
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