properly intersect的用法和樣例：
例句
- A unicoursal curve is formed by starting at any point on a sheet of paper and drawing a smooth line that may intersect itself.
一條單行曲線是指從紙上任意一點出發畫出的一條光滑的可以自身相交的曲線。 - The pie shape is defined by a partial outline of an ellipse and the two radial lines that intersect the endpoints of the partial outline.
扇形由橢圓的一部分輪廓和兩條與部分輪廓的終結點相交的射線定義而成。
