septum secundum

例句：

1. 1.The professor explained the concept of septum secundum in detail.
   教授详细解释了第七节的概念。
2. 2. The researcher found evidence supporting the theory of septum secundum.
   研究人员发现了支持第七节理论的证据。
3. 3. Due to the complexity of the problem, it is important to understand septum secundum before proceeding with the solution.
   由于问题的复杂性，在继续解决问题之前，理解第七节是非常重要的。