对称差运算

The symmetric difference of the sets is one of the basic operation of the sets, and it plaies an important role in measure theory and its applications.

集合的对称差是集合的基本运算之一，它在测度论及其应用中扮演着一个重要的角色。

Common uses for sets are fast membership testing, removing duplicates from a sequence, and computing mathematical operations such as intersection, union, difference, and symmetric difference.

集合的常用场合是快速测试某元素是否在集合中，或者是从一个有序类型中删除重复元素，或者是做一些数学运算，比如求集合的交集、并集、差和对称差。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。