... 项目群定义说明书：Program Definition Statement (PDS) 项目群定义阶段：Program Definition Phase 项目群大型项目：Program ...
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program definition phase
程序定义阶段
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The completion of the so-called System Requirements Review and System Definition Review allows program managers to proceed into the rocket's preliminary design phase, NASA officials said.
MSN: Giant deep-space rocket passes key test - Technology & science - Space - Space.com | NBC News
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