n.(笔的)圆珠笔
The diary comes complete with a gold-coloured ballpoint pen.
这个日记本配有一支金色的圆珠笔。
I took a ballpoint pen and punched a hole in the carton.
我拿了一支圆珠笔,在纸盒上戳了一个洞。
He snapped the cap on his ballpoint.
他吧嗒一声把笔帽扣在了圆珠笔上。