• "So many kids got see two African-American men floating around in space.."

    VOA: standard.2010.02.02

  • Likewise, when in outer space, when you are orbiting the Earth, people are always floating around in these space stations.

    就好比在外太空,当你在绕地球运行时,宇航员总是悬浮在太空站

    耶鲁公开课 - 基础物理课程节选

  • Likewise, when in outer space, when you are orbiting the Earth, people are always floating around in these space stations.

    就好比在外太空,当你在绕地球运行时,宇航员总是悬浮在太空站

    耶鲁公开课 - 基础物理课程节选

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