Based on the principle of superposition of plane waves, the same expressions are derived as those based on Maxwell 'e field equations.

从平面波叠加原理出发，导出与从麦克斯韦方程组出发同样的表达式。

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I just tell them it's not my area, and promise to contact one of our people from that field and e-mail them back.

我只是告诉他们这不是我的业务范围，并保证联系我们那个领域的人，给他们回邮件。

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An e-mail to the network from Janet Anderson, director of the EPA's bio pesticides division, says "there is no record of a review and/or clearance to field test" the organism.

环保署生物杀虫剂部门主管珍妮特·安德森发给该网络的一封电子邮件表示，“没有对这种生物进行审查和/或野外测试的记录。”

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But the field of e-health, as it's called,is moving forward, and some of the most notable advances are happening in developing countries.

VOA: standard.2010.02.24

Be careful every time you enter a name in an e-mail "To" field, because the e-mail application may autocomplete the field with a similar-looking name.

FORBES: Magazine Article

Enter "m.google.com" or "m.hotmail.com" in the Server field, leave the Domain field blank, enter your full e-mail address in the Username field, and your password in the Password field.

CNN: 10 essential iPhone tips, new and old

Most important, the agency pricing model levels the playing field for e-book retailers.

CNN: A dark day for the future of books