Those fears, it is argued, stem from a double squeeze on America's middle class.

这些担心，被认为是由于美国的中产阶级遭受双重打击。

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Bug patterns often stem from confusing features of the language or the class library; this bug pattern stems from the somewhat counterintuitive fact that RuntimeException extends Exception.

bug模式通常源自语言的模糊功能或类库；出现此bug模式是因为RuntimeException扩展了Exception，这稍微有点违反常理。

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In the field of stem cells, China is showing that it can do world-class science.

在干细胞研究方面，中国已经达到世界先进水平。

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Study the best and as one of the students here, Mariam -- came to me after the class and she said, " "the tip of the stem is actually about democratizing excellence."

研究最好的，正如Mariam同学-,课后找到我时说的，“流行学术其实是要将杰出大众化“

哈佛公开课 - 幸福课课程节选

Economic growth and prosperity for working people and the middle class does not stem from increased spending and consumption.

FORBES: The Fiscal Cliff and America's Coming Recession

The guy studying neuronal stem cells soon became the guy studying Spanish and training to become one of the few family physicians in his class.

NEWYORKER: The Hot Spotters