| 释义 |
焦点jiāodiǎn
1.某些与椭圆、双曲线或抛物线有特殊关系的点。如椭圆的两个焦点到椭圆上任意一点的距离的和是一个常数。{focal point; focus; point that has a special relationship with an ellipse, hyperbola or parabola. For example, the sum of the distances between either focal point of an ellipse and any point on the ellipse is constant.}
2.平行光线经透镜折射或曲面镜反射后的会聚点。{focal point; focus; point at which parallel rays of light converge after being refracted through a lens or reflected from a concave mirror}
3.〈比喻fig.〉事情或道理引人注意的集中点{centre of interest or activity; central issue; focus}:
争论的～。{focus of controversy; point at issue} |