Discovery Program:
NASA's Discovery Program (as compared to New Frontiers, Explorer, or Flagship Programs) is a series of lower-cost, highly focused American scientific space missions that are exploring the Solar System.
en.wikipedia.org
Discovery Program:
NASA的發現計劃是一系列探索太陽系的低成本，任務目標非常聚焦的美國科學太空任務。
zh.wikipedia.org
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Discovery ProgramDiscovery Program