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Isaacman also said the agency would halt work to develop a more powerful version of the SLS rocket's upper stage, known as the Exploration Upper Stage, or EUS. Instead, NASA will go forward with a "standardized," less powerful stage but one that will minimize major changes between flights and utilize the same launch gantry.，更多细节参见旺商聊官方下载
Grammar and flow could use improvement，这一点在快连下载安装中也有详细论述
Анна Габай (Редактор отдела «Силовые структуры»)，详情可参考im钱包官方下载