• Case 1 When NASA began the launch of astronauts into space, they found out that the pens wouldn"t work at zero gravity (ink won"t flow down to the writing surface).

    美国航空航天局准备宇航员送往太空时,他们发现钢笔重力情况出来(墨水无法流出来印书写材质上)。

    youdao

  • Case 1 When NASA began the launch of astronauts into space, they found out that the pens wouldn"t work at zero gravity (ink won"t flow down to the writing surface).

    美国航空航天局准备宇航员送往太空时,他们发现钢笔重力情况出来(墨水无法流出来印书写材质上)。

    youdao

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