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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They place the stove in the middle of the house, and stem the gaps in the window.

他们将火炉放在屋子中间，堵上了窗户的缝隙。

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Lowest cauline leaf below middle of stem; pedicel longer.

茎的最低的茎生叶中间以下；长时间的花梗。

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

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Polls show Americans who consider themselves conservatives are split right down the middle on whether they support stem cell research, and some pro-choice Americans actually oppose embryonic stem cell research.

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Now in its third year, the National STEM Video Game Challenge is a competition among middle school and high school kids who design their own video games.

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