Windows xp is based on a 10-year-old operating system .

windowsxp基于的是一个10年前的操作系统。

Group xp profit calculation has been balanced .

组队经验分成的计算已经被平衡化。

Xp is both a philosophy about programming work and a set of guidelines to do it .

极限编程既是一种编程哲学，又是一组实践准则。

Note that it works only on pcs running windows xp and windows vista .

注意它只能在运行windowsxp和windowsvista的电脑上使用。

But what about those 800m pcs still running windows xp ?

但那些依旧运行windowsxp系统的个人电脑咋办呢？