Fincke, 58, is a Pennsylvania native with a wife and three children. He joined NASA in 1996 and is now a veteran of four spaceflights: Expedition 9 in 2004, Expedition 18 in 2009, STS-134 in 2011, and most recently Expedition 74, for which he served as commander.
"It indicates a gradual downward curve in wholesale energy prices," he said.
，这一点在91视频中也有详细论述
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在这个示例中，我们使用最成熟的 proto3 语法。