a pen that has a small metal ball as the point of transfer of ink to paper
例句
用作名词 (n.)
The ballpoint pen was invented by Biro. 圆珠笔是由拜罗发明的。
You jab your forehead incessantly with a pen in the hope that this will encourage some sort of intelligent thought to flow from your brain to the paper via your biro. 你不停地用笔戳着前额，仿佛这样就能从大脑中汲取一些灵感，让它顺着圆珠笔流淌到卷面上似的。
美
['baɪroʊ]
