ballpoint penn.原子筆圓珠筆；走珠筆；書寫圓珠筆複數：ballpoint pens 例句1.A ballpoint pen is always used to do his exercises.他的作業總是用圓珠筆做。2.May I try out thIs ballpoInt pen, please?我試一下這支圓珠筆可以嗎3.I want a ballpoint pen.我要買一支圓珠筆。4.Sometimes, I also buy some lotteries to try my fortune, yet the only prize I get from it is a ballpoint pen.有時候，我也會買一些彩票試試運氣，但如今我得到的唯一獎品就是一支原子筆。5.Weird Fact: A mouse can fit through a hole the size of a ballpoint pen怪異的事實：能鑽進圓珠筆洞大小的老鼠