This struggle is sharp and complex. We can never let down guard.

这场斗争是尖锐复杂的，我们决不能掉以轻心。

《新英汉大辞典》

BUT WHERE is this struggle headed?

但是，这一斗争走向何方？

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And human society is part of this struggle.

人类社会也是这种斗争的一部分。

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The British philosopher Herbert Spencer described this struggle as "survival of the fittest."

VOA: special.2009.02.25

Why this struggle, and why must Milton struggle with such awkward metaphysical categories in order simply to address properly the power of light?

为什么弥尔顿必须,与这样一个奇怪的抽象的东西斗争,仅仅是为了恰当的描述光明的力量？

耶鲁公开课 - 弥尔顿课程节选

The greatest tragedy of American history arguably is that this struggle could not be decided by debate.

美国历史上最大的悲剧可以说是,这场斗争不能由辩论来决定

耶鲁公开课 - 美国内战与重建课程节选

"Prevailing in this struggle is essential to our future as a nation, " Mr. Bush said.

CNN: 'Setting Expectations Tour' is Bush's segue into September

The first two movements explore this struggle between darkness and light with no resolution.

NPR: Mahler's Fifth Symphony: The Everest of Music

All civilized nations are in this struggle together, and all must fight the murderers.

CNN: Transcript of Bush's U.N. address