He snapped the cap on his ballpoint.他吧嗒一声把笔帽扣在了圆珠笔上。I changed the ink cartridges in my ballpoint pen.我换了圆珠笔里的墨水芯.You can buy the ballpoint pen anywhere.你到哪儿都能够买到这种圆珠笔.The diary comes complete with a gold-coloured ballpoi...
He snapped the cap on his ballpoint.他吧嗒一声把笔帽扣在了圆珠笔上。There is an overflow of cheap ballpoint pens in the market.市场上圆珠笔泛滥.I changed the ink cartridges in my ballpoint pen.我换了圆珠笔里的墨水芯....