如何使用 "graptolite" 造句

1. On some problems of the definition of the graptolite species and subspecies .
试论确定笔石种和亚种的几个问题。
2. Zonation and diversity of the early ordovician graptolite fauna of yushan , jiangxi .
江西玉山早奥陶世笔石动物群的分带及分异。