Based on the strain superposition principle, the phenomenon of mean stress reduction in metals plastic processes with vibration is explicated. and the mechanism of volume effect is described.

基于应变叠加原理的基本思想。阐释了金属振动塑性加工平均应力减小的原因，给出了体积效应机理的数学描述。

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The principle and the apparatus of hydrogen reduction of metal oxides are described.

叙述了氢气还原金属氧化物的过程、装置和工艺过程。

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In this paper, the observation principle and data reduction method of HIPPARCOS are described.

本文主要描述依巴谷卫星的光学观测原理，资料处理方法。

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In other words, the reduction of excitation is obviously something that the pleasure principle is all about.

换句话说快乐原则关注的不就是,减少兴奋吗？

耶鲁公开课 - 文学理论导论课程节选

But one of the things you heard the President of the United States say on New Year's Day when this fiscal cliff challenge was resolved is that the agreement enshrined the principle that we must have balance as we move forward in our deficit reduction.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,

Boris Yeltsin and I agreed in principle on this same reduction, and there was no way in the wide world he could get it through the Russian Duma that existed at the time in his second term.

WHITEHOUSE: Press Briefing with President Obama and President Clinton

They chose not to because they refused to accept the principle that the well-off and well-connected ought to pay a little bit towards deficit reduction.

WHITEHOUSE: Press Briefing