Uncontrolled airspace is designated Class F, while controlled airspace below 5,490m above sea level and not in the vicinity of an airport is Class E.

无交通管制的空域被定为等级 F，而低于海拔5490米、不在机场附近的管制空域是等级 E。

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The spokeswoman says if you get an e-mail you are not sure about, forward it or send a separate message to ContactETS@ets.org.

VOA: special.2010.02.18

How many of you did not bring the passages that I sent to you by e-mail last night?

你们中有多少人没有带讲义,我昨晚用邮件发给你们的？

耶鲁公开课 - 文学理论导论课程节选

And there's actually a way that we can make predictions here, and what I'll tell you is molecular orbital theory predicts that h e 2 does not exist because it's not stabilized in terms of forming the molecule.

其实我们有一种办法可以做出预测，我要告诉你们的是分子轨道,理论预测He2不存在,因为它形成分子不稳定。

麻省理工公开课 - 化学原理课程节选

As for the original bookstore chain, its chairman, Leonard Riggio earlier this year said he wanted to buy its 700-strong chain himself, but not the e-book reader.

BBC: Barnes & Noble shares jump 24% on reports of Nook bid

No, Constant Contact is not the best e-mail marketing service around.

FORBES: Is Constant Contact The Best E-Mail Marketing Service?

Van Rompuy said that Greece will not leave the E.

FORBES: Here's Why Greece Leaving The EU Could Cause Another Depression