mastolith

例句：

1. 1.The team discovered a mastolith in the cave that could be millions of years old.
   该团队在洞穴中发现了一个数百万年历史的石核。
2. 2. The discovery of this mastolith has sparked renewed interest in ancient civilizations.
   这一石核的发现激发了人们对古代文明的重新兴趣。
3. 3.The researcher collected samples from the site and plans to analyze them for their potential use as building materials.
   研究人员从现场收集了样本，并计划分析它们作为建筑材料的潜在用途。