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).
例一当美国航空航天局准备将宇航员送往太空时，他们发现钢笔在零重力情况下写不出来（墨水无法流出来印到书写材质上）。
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).
例一当美国航空航天局准备将宇航员送往太空时，他们发现钢笔在零重力情况下写不出来（墨水无法流出来印到书写材质上）。
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