In the past, sound engineers worked in the back rooms of recording studios, but many of today's sound professionals are sharing their knowledge and experience with professionals in other fields to create new products based on the phenomenon we call sound.

过去，声音工程师在录音室后台工作，但今天许多研究声音的专家正在与其他领域的专业人士分享他们的知识和经验，利用我们称之为声音的现象来创造新产品。

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Looking back on your day, you will find it hard to deny that a horseback Safari is as close as you will ever come to answering the call of the wild.

回顾这一天，你会发现骑马观赏野生动物将是你最接近于回应野性呼唤的一次体验，这是难以否认的。

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If you are making a long distance call on a public telephone and run out of money, give the number on your phone to the person you're talking to. Then hang up the receiver and he can call you back.

如果你用公共电话打长途，钱花光了，把你的电话号码给你正在通话的人，然后挂上电话，他会给你回电话的。

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We're going to stand up and push back and call on the Federal government to secure our borders."

VOA: standard.2010.05.08

He said to call back on Monday when the agency should have more information.

WSJ: Russia Distances Itself From Chechen Brothers

Other analysts are known to have published reports praising companies to the skies, and then tell fund managers who ring up for more information to call back on a private mobile number - so the analysts can tell the fund manager (on a phone line that is not being tape recorded) to ignore the report and avoid the stock like plague.

BBC: Analysts - the scourge of the City?

And when I call them, they are often busy, and we get a message saying that we have to call back later on.

WHITEHOUSE: President Obama Talks Jobs in Allentown