交点:线与线、线与面相交的点。这个词在几何学中经常使用,是几何学的一个专业术语。例如,两条直线相交,有一个交点。焦点:①某些与椭圆、双曲线或抛物线有特殊关系的点。这个义项,是一个几何学专业术语。与“交点”含义完全不同。例如,一个椭圆内部有两个焦点。②平行光线经透镜 Intersection: Line and line, line and surface intersection point. The term is often used in geometry and is a term of geometry. For example, two straight lines intersect with one intersection. Focus: ① Some oval, hyperbolic or parabolic point has a special relationship. This meaning is a geometric jargon. And “intersection ” meaning is completely different. For example, there are two focal points inside an ellipse. ② parallel to the lens through the light