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%.
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%。
Single stem weight and harvest index were both high and stable in the stable yield cultivars.
稳产性好的品种单茎干重大而稳定，收获指数高并有一定的稳定性。
It seems that the amorphous iron oxide may be used as an indirect index for the evaluation of high yield paddy soils with good structure.
看来，无定形氧化铁的含量可以作为高产水稻土具有良好结构性的一个间接指标。
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