笔的族群可谓兴旺庞大:毛笔、铅笔、圆珠笔、钢笔……然而,现在使用最多的还是钢笔。钢笔算得上是笔类中的中坚力量。钢笔是笔尖由金属制成的书写工具。按储藏墨水的方式,钢笔从笔的族群中引出说明的对象——钢笔。你能说说这一段采用了那几种说明方法?可分为蘸水钢笔和自来水 The group of pens can be described as flourishing: pens, pencils, ballpoint pens, pens... However, pens are the most used ones. The fountain pen is the backbone of the pen class. A pen is a writing instrument whose tip is made of metal. According to the manner in which ink is stored, the fountain pen draws out the object described by the pen—the pen. Can you tell us which methods are used in this paragraph? It can be divided into fountain pens and tap water.