2.2.3 Mermaid 类图（classDiagram）
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但只要稍微理性分析，就会发现这根稻草，根本撑不起崩塌的大厦。
"We've got to do something where we can get more value out of space and the lunar surface than we put into it. And that's how you really ignite an economy, and that's how everything we want to do in space is not perpetually dependent on taxpayers."