One winter day in 1891, a class at a training school in Massachusetts, U. s. a, went into the gym for their daily exercises.

1891年冬季的一天，美国马萨诸塞州一所培训学校的一个班走进体育馆进行日常训炼。

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This week, as part of a new series called Living In the Middle, NPR takes a closer look at what it really means to be middle class in the U. S.

这一周，作为一个叫《生活在中产》的新系列中的一部分，NPR深入研究美国的中产阶级到底是什么意思。

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NASA's newest class of astronauts signed up knowing there'd be no U. S. rockets to launch them into space, at least not in the immediate future.

NASA的最新宇航员被告知并不会有美国的火箭送他们进入太空，至少短期内是这样的。

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Ross and his colleagues offered parallel columns of upper-class (U) speech versus the speech of (non-U) middle-class people trying to attain, or pretend to, upper-class status.

NEWYORKER: The English Wars

They've done a spectacular job for their clients and we continue--we're very excited about, one, we're excited about the region and two, we're excited to have a team of that quality doing real, on the ground research throughout China, which is, now, if you sort of look at the larger Chinese market, it's the second-largest market in the world, and there just aren't--there are many more world-class U.S. teams than there are world-class Chinese teams.

FORBES

We will foster greater cooperation with the private sector to provide a world-class U.S. travel experience.

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