把铅笔竖起来并不难,但要把铅笔扔上天,让它掉落的时候仍然竖着就很难了。如果有人说,他能让扔上天的铅笔掉落时平稳地竖立在晃荡的海面上,你信吗?想要完成海上竖“铅笔”挑战的其实是一家来自美国的公司,而且这支“铅笔”还是一枚巨大的火箭。最终,Space X(美国太空探索技术)公司的火箭在完成了向国际空间站运送补给物资的任务后,稳稳地落在了位于大西洋的遥控船上,挑战成功! It’s not hard to put a pencil up, but it’s hard to throw a pencil on it and keep it up when it’s dropped. If anyone says he can make the drop of the sky-bound pencil steady on a sloping surface as you drop it, do you believe that the challenge of completing the vertical pencils is actually a U.S. company, “Pencil ” is still a huge rocket. Eventually, Space X (Space Exploration Technologies) rockets steadily landed on a remotely controlled ship on the Atlantic after completing their mission of delivering supplies to the ISS. The challenge was successful!