spheroidite cementite

例句：

1. 1. The mineral depositis rich in spheroidite.
   这个矿藏富含球状石。
2. 2. The constructionof the new bridge was made possible bythe discovery of spheroidite.
   新桥梁的建设得益于发现球状石。
3. 3. Thespheroidite has a unique texturethat makes it suitable for polishing.
   球状石具有独特的纹理，适合抛光。