The difference between Class E and A airspace is that in Class A, all operations are IFR, and pilots must be instrument-rated, that is, skilled and licensed in aircraft instrumentation.

E 级和 A 级空域的区别在于，在 A 级空域，所有操作都需遵照仪表飞行规则，飞行员必须要有仪表等级，也就是说，要有操作航空仪表方面的技术和执照。

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Take up cognitive leisure activities. Learn a language, take up an instrument, take a class or work crosswords or puzzles.

进行一些认知的休闲活动。学习一门语言，练习一种乐器，上一门课程或者做字谜或难题。

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Mr. Edwards's class got a new instrument.

爱德华兹先生的班级得到了一件新仪器。

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In many ways, The Visitor is a movie about taking a leap of faith, whether it's moving to a new country, befriending someone from a different class or culture, or learning a new instrument.

NPR: Learning to Drum �� and Live �� in 'The Visitor'

In some respects, the 2014 S-Class even surpasses what Bentley offers, as with its high-tech instrument panel and a new user interface that took more than 300 programers several years to develop.

FORBES: With Trendsetting Technology, 2014 Mercedes-Benz S-Class Gets All Up In Bentley's Business