Testacea

例句：

1. 1. The geologist used the Testacea to analyze the mineral composition of the rock.
   地质学家使用测试石来分析岩石的矿物组成。
2. 2.The chemical analysis was conducted using Testacea samples collected from the site.
   化学分析是在采集自现场的测试石样本进行的。
3. 3.The Testacea is a valuable tool for studying the geological history of the region.
   测试石是研究该地区地质历史的重要工具。