The reason for the division of Class E and Class A airspace stems from the type of planes operating in them.

E 类和 A 类空域的划分取决于在这两类空域飞行的飞机类型。

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One 2013 study of college students found that 80% of students use their phones or laptops during class, with the average student checking their digital device 11 times in a typical class.

2013年的一项关于大学生的研究发现，有80%的学生在课上使用手机或笔记本电脑，在一堂平常的课上，平均每个学生查看数码设备的次数高达11次。

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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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The National Association for Sport and Physical Education says twenty to thirty students in a P.E.class should be the limit.

VOA: special.2009.08.06

I'm going to define a class, and in particular, what I'm going to do, is walk through what that says.

我们碰到了一个问题，这个问题就是，我们想要建立，一个抽象数据类型。

麻省理工公开课 - 计算机科学及编程导论课程节选

So it's kind of... it's nice that you can choose because I feel like you have a better time in class.

可以自己选课是件很好的事情，因为这样你在课堂上感觉会更好。

高中生活怎么样？ - SpeakingMax英语口语达人

In interviews with The Associated Press, friends and family members described Duncan as a man who grew up in a working class family in Boiling Springs, a rural area at the base of the Blue Ridge Mountains.

NPR: SC Man Among Leaders Arrested In FL Gambling Probe

In the US a retired woman sued banks in a class action suit claiming unjust enrichment under the tenets that it made payments far more expensive than they should have been.

FORBES: LIBOR Liabilities: How litigation will drive down banks profitability for years to come...

It would be rude to be speaking to someone face-to-face then answer a phone call, but I can be talking to someone, or even sitting listening to a professor in a class, and also quickly answer a text message at the same time.

FORBES: Young People, Stop Just Texting Me and Give Me a Call Once in a While PLZ! Part Deux