When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in zero gravity.

To combat the problem, NASA scientists spent a decade and $12 billion to develop a pen that writes in zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to 300°C.

在美国太空总署第一次派太空人上太空时，他们很快发现圆珠笔无法在零重力的情况下工作。

为了解决这个问题，美国太空总署花了10年时间和120亿美元研发了一种可以在零重力，倒置，水下，和几乎一切表面包括玻璃上书写，适应温度的范围从0摄氏度到300摄氏度的钢笔。

The Russians used a pencil.

而俄国人用铅笔【研发圆珠笔查看网站：[db:时间]】