优课用英语怎么写
英文写法翻译
U-class
重点词汇
优课───U-class
双语使用场景
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。
winter day in 1891, a class at a training school in Massachusetts, U. s. a, went into the gym for their daily exercises.───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。
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。