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(xiàn)是指從紙上任意一點(diǎn)出發(fā)畫(huà)出的一條光滑的可以自身相交的曲線(xiàn)。 - 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(diǎn)相交的射線(xiàn)定義而成。
