the standard and poor's 500翻译过来是标准普尔...普尔是什么?是指数还是计量单位?

1. the standard and poor's 500翻译过来是标准普尔...普尔是什么?是指数还是计量单位?

是指数
1.   Better-than-expected results allowed stocks to extend their best April rally in four years, and one that pushed the Nasdaq composite index and the Standard &Poor's 500 index to six-year highs.
高于期望值的结果使得股市在今年四月份达到四年来最大反弹，推动了纳斯达克综合指数和标准普尔500指数达到六年来的高度。
 2.   But I want to present to you a group of investors who have, year in and year out, beaten the Standard &Poor's 500 stock index.
但是，我要提供一组投资者的绩效供各位参考，他们长期的表现总是超越史坦普500种股价指数。
 3.   That compares to an 18 percento return for all U.nS. stock funds, and 26 percent for the Standard &; Poor's 500 Index during the same period.
与之相比，同阶段美国所有的证券基金的平均收益是18％，标准普尔500指数的平均收益是26％。