primary stratigraphic trap

例句：

1. 1. The primary stratigraphic trap is a crucial component in the study of geological history.
   主要地层陷阱是研究地质历史的关键组成部分。
2. 2. The discovery of this primary stratigraphic trap has revolutionized our understanding of plate tectonics.
   这个主要地层陷阱的发现已经改变了我们对板块构造的理解。
3. 3. The primary stratigraphic trap was used to trap sediments from the riverbed, which helped preserve the fossils for future research.
   主要地层陷阱被用来捕捉河床的沉积物，这有助于保存化石供未来研究使用。