Ancient laborers paid great attention to adopting various techniques to improve soil quality when plowing the soil, so that the soil could keep sustainable fertility and high rate of yield.

古代劳动人民在土壤耕作过程中，非常注意采用各种技术对土壤性质进行改良，以期土壤保持长久不衰的肥力和高产出率。

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Buying them tends to push up the price; that tends to influence the yield down so it encourages a lower level of interest rate.

买进它们，导致价格上升；,导致参数降低,所以它鼓励一个低的利率水平。

耶鲁公开课 - 金融市场课程节选

Here is a chart which shows the credit spread of high yield bonds vs. the default rate of high yield bonds since 1997.

FORBES: Connect

The remaining spread of the mortgage rate over the Treasury yield represents the risk of prepayment and underwriting costs.

WSJ: Low-Interest Mortgages Are the Answer

Hon Hai Chairman Terry Gou said last month that the yield rate of Apple's touch-screen devices hasn't been satisfactory and has hurt its profitability.

WSJ: Apple Preparing For New iPhone in Third Quarter