Whether conventional journals are necessary in the Internet age is a matter of active debate.

传统期刊在如今这个网络时代是否有存在的必要已经引发了不少讨论。

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With a conventional PBX, separate networks are necessary for voice and data communications.

用常规p BX时，话音和数据通信必须有两个分开的网络。

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If necessary, the system can also be used for conventional communication purpose.

如果必需，系统也能用于传统的通信用途。

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They know the Indiana Pacers have a size advantage, realize that Carmelo Anthony is going to get beat up banging against a bulkier body, and understand that a change to a lineup with a conventional power forward may become necessary.

WSJ: Knicks not planning lineup change vs bigger Pacers

And just as we will always back up that commitment with the conventional and nuclear strength that is necessary to defend our allies, we are now backing up that commitment with new capabilities as well.

WHITEHOUSE: President Obama��s Statement at NATO Summit

Butterfield is challenging the conventional gaming wisdom that nihilistic killing is necessary to build a popular game.

FORBES: Glitch Is Flickr Founder's Quirky, Ambitious Non-Violent Game