He called the planet "Spaceship Earth."
VOA: special.2010.05.30
If you escape the pull of gravity, your spaceship will be off, won't be orbiting the Earth.
如果你完全脱离重力,太空船早就飞得没影了,而不是在轨道上运行
耶鲁公开课 - 基础物理课程节选
Humans,he said, are astronauts on Spaceship Earth.
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