今天标普500指数下跌幅度抹去了当月累计的上涨幅度。

Today’s equity slump erased the month-to-date gain in the S&P 500.

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整体的标普500指数在五年前的指标之上，房产建筑商信心指数在60%以下。

The overall S&P 500 index is above its mark of five years ago; the homebuilders index is 60% below.

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汤姆逊金融公司的迈克•汤姆逊这样说道，自1991年，高收益债券和标普500指数之间的相关性就非常低，不到20%。

Mike Thompson of Thomson Financial says that, since 1991, the correlation between the performance of high-yield bonds and the S&P 500 index has been pretty low—less than 20%.

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And this spin magnetic quantum number we abbreviate as m sub s, so that's to differentiate from m sub l.

这个自旋磁量子数我们把它简写成ｍ下标ｓ,以和ｍ小标ｌ有所区分。

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So there's two different orbitals that can have these three quantum numbers, but if we're talking about electrons, we can also talk about m sub s, so if we have two orbitals, how many electrons can we have total?

所以有两个轨道可以有,这三个量子数，但如果我们讲的是电子，我们还要考虑ｍ小标ｓ,如果我们有两个轨道，一共有多少个电子呢？

麻省理工公开课 - 化学原理课程节选

m And the third one is called m, l it's also m sub l.

第三个量子数叫做，也叫做m小标。

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