primary oval foramen

例句：

1. 1.The primary oval foramen is a small opening in the wall that allows air to flow through.
   初级椭圆形孔隙是墙壁中的一个小开口，允许空气流动。
2. 2.The primary oval foramen is essential for the proper functioning of the lungs.
   初级椭圆形孔隙对于肺部的正常功能至关重要。
3. 3.The discovery of this primary oval foramen has led to new insights into the structure and function of the lungs.
   发现这个初级椭圆形孔隙有助于我们深入了解肺部的结构与功能。