To make its case, RKK Energia took the unusual step - at a preliminary design stage - of ordering the construction of an experimental propulsion system.
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。
This stage is Paramount, as Spring needs to take into account dependencies between components, specific ordering, and construction mechanisms.
这一阶段极为重要，因为Spring需要需要考虑组件间的依赖、特定顺序、以及构造机制。
Where there is a necessity that Designer shall cooperate with Employer in ordering the process of construction materials and equipments, the relevant charge shall be paid by Employer.
发包人需要设计人配合建筑材料、设备的加工订货时，所需费用由发包人承担。
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