rosette graphite

例句：

1. 1. The teacher used arosette graphite to write onthe blackboard.
   老师用粉笔石墨在黑板上写字。
2. 2. The graphite pencil leadsare made from natural graphite.
   这种铅笔芯是由天然石墨制成的。
3. 3. The graphite is used in theproduction of pencils and pens.
   石墨用于制造铅笔和钢笔。