▸ 太空人tài kōng rén在zài环绕huán rào地球dì qiú时shí发现fā xiàn，普通pǔ tōng原子笔yuán zǐ bǐ在zài失重shī zhòng状态zhuàng tài下xià无法wú fǎ使用shǐ yòng。

When astronauts were orbiting the Earth, they discovered that ordinary ballpoint pens could not be used in a zero-gravity environment.

▸ 于是yú shì，一群yī qún科学家kē xué jiā耗费hào fèi多年duō nián时间shí jiān，投入tóu rù大量dà liàng资金zī jīn，终于zhōng yú研发yán fā出chū一种yī zhǒng神奇shén qí太空笔tài kōng bǐ。

So, a group of scientists spent many years and invested a large amount of money to finally develop a remarkable space pen.

▸ 无论wú lùn零重力líng zhòng lì、极端jí duān温度wēn dù，甚至shèn zhì倒着dào zhe写xiě，都dōu能néng流畅liú chàng书写shū xiě。

It can write smoothly regardless of zero gravity, extreme temperatures, or even when writing upside down.

▸ 然而rán ér，在zài这一切zhè yī qiè之前zhī qián，太空人tài kōng rén怎么zěn me解决jiě jué这个zhè ge问题wèn tí呢ne？

However, before all of this, how did astronauts solve this problem?

▸ 他们tā men用yòng铅笔qiān bǐ。

They used pencils.

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