"It is needlessly complicated to alter the configuration of the SLS and Orion stack to undertake subsequent Artemis missions," Amit Kshatriya, NASA's associate administrator, said in a statement.
当需求不稳定、价格下探、技术迭代叠加在一起时，这门生意的风险结构就变得复杂。，推荐阅读91视频获取更多信息
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Source: Computational Materials Science, Volume 267
Real-world failures，详情可参考同城约会