A systems requirements review (SRR), preliminary design review (PDR), and critical design review (CDR).

系统需求检查(systems requirements review, SRR)，初步设计检查(preliminary design review, PDR)，和关键设计检查(critical design review, CDR)。

In the preliminary design stage, the designer emphatically considered the product should have function.

初步设计阶段，设计者着重考虑产品应该具有的功能。

Ship piping system design has five consecutive phases: preliminary design, detail design, production engineering, and system-support information.

船舶管系设计由五个连续的阶段组成：初步设计、功能设计、详细设计、生产设计和系统支持信息。

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。

Then, by using the results of the analyses, the preliminary design of the implementation of SEND protocol and its extension on a LINUX system is proposed.

根据分析结果，论文中提出了对于SEND协议及其扩展的实现的概要设计，分别描述了主机节点以及路由器节点上的系统框图以及状态转移图。