knot projection

例句：

1. 1. The knot projection on the wall is a great design element.
   墙上的结点投影是一个很棒的设计元素。
2. 2. In the study of physics, knot projections are used to model complex systems.
   在物理学研究中，结点投影被用来模拟复杂的系统。
3. 3. The knot projections in the data set indicate that there are significant differences between different groups.
   数据集中结点投影表明不同组之间存在显著差异。