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1938年,匈牙利的比罗兄弟设计发明了圆珠笔。圆珠笔的笔尖是一粒小小的钢珠,书写的时候,笔芯里贮存的墨水通过毛细作用润滑了钢珠,均匀地渗出墨水,达到书写的目的。
In 1938, the Biro brothers of Hungary invented the ballpoint pen. The tip of the ballpoint pen is a small steel ball. When writing, the ink stored in the ink cartridge lubricates the steel ball by capillary action and evenly bleeds out the ink to achieve the purpose of writing.