This is not only necessary, but it also adds variety to his teaching.

这不但是必要的，而且它还使他的教学富于变化。

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But in today's world, advertising is not only necessary but also helpful.

不过，在今天的世界里，广告不仅必不可少，而且还很有益处。

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The results show that setting fractal geometry as a selected topic at high school is not only necessary but also feasible.

结果表明，在高中数学课程中开设“分形几何”这一选修专题不但必要而且可行。

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"What is necessary in this case is a collective effort, not only by the researchers and the people on the ground, but also the donor community, because controlling those two diseases can go a long way in improving people's food security and livelihoods in Sub-Saharan Africa."

VOA: special.2009.09.21

Eliot was there, in that essay on the metaphysical poets that I'm quoting from, defending as necessary what is the primary characteristic, not only of his own poetry, but really of modern poetry generally, what is often called its difficulty.

艾略特在描写那些抽象派诗人的文章里,就是我引用的那篇，极力维护,诗人的首要特征，不仅是因为他自身的诗性，更因为维护现代诗歌的必要，这是非常困难的一件事。

耶鲁公开课 - 现代诗歌课程节选

The point is the bike is not only being perceived as a necessary alternative, it is also drawing human ingenuity back to the simplest of objects.

FORBES: How to Downsize Yourself

The building's developer, Maik Uwe Hinkel, said the relocation of a section of the wall is necessary not only to allow street access for the luxury tower, but also is demanded by the city to allow access to a planned waterside park and bridge for pedestrians and cyclists.

WSJ: In Berlin, Wall Divides Developers, Protesters

Also, online competitors who are currently shipping these lower dollar purchases for free are subsidizing the freight and this is not a sustainable practice, so it is only necessary for Best Buy to weather the storm until online retailers discontinue this practice.

FORBES: Move up http://i.forbesimg.com t Move down