“圆珠笔”用英语怎么说

莫妮卡拿起她的伯罗圆珠笔，放在牙齿间转动着。Monica picked up her Biro and revolved it between her teeth.他吧嗒一声把笔帽扣在了圆珠笔上。He snapped the cap on his ballpoint.市场上圆珠笔泛滥.There is an overflow of cheap ballpoint pens in the market....