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In this paper, the control factors of anaerobic digestion are discussed based on the summarization of present research literatures. The mechanism of the effect of pH and Eh on anaerobic digestion is analyzed with microbiology and biochemistry theory. The equation describing the effect of pH variation on Gibbs free energy variationΔGis derived using Nernst equation, and the specific control conditions in engineering are summed up according to the present research achievements.

在总结已有文献的基础上，讨论厌氧消化过程的控制因素，并利用微生物学和生物化学理论分析了pH值和Eh对厌氧消化过程影响的机理；利用Nernst方程推导出了描述pH值变化对吉布斯自由能变化ΔG的影响的方程式；并结合已有的研究成果，总结了实际工程中的具体控制条件。

The introduction describes the historical background and the investigation scope of the national theory of socialism with Chinese characteristics, elucidates the basis and significance of the present study, introduces the basic research status of this subject at home and abroad, and clarifies the theoretical framework, focus and innovation of the present study.

导论主要论述了中国特色社会主义民族理论的历史背景和考察范围，从而说明了论文选题的依据；同时也阐明了研究中国特色社会主义民族理论的意义，介绍了国内外对本课题研究的基本状况，说明了本课题研究的理论框架、重点和创新；导论还指出了本课题研究所采用的主要研究方法。

While in the case of Los Angeles all the three classes present their peaks at population of about 1,000 to 10,000 people/km2, New York and Atlanta seem to present a more logical pattern, with distributions of CIT decreasing and LIR and HIR increasing with increasing population densities.

图3 作为人口密度函数的商业、工业、运输等级分布呈现一种清晰高峰：洛杉矶、菲尼克斯和西雅图的人口密度高峰为10，000~100，000人/平方米；菲尼斯与西雅图的人口居住密度高峰少于100人/平方米；洛杉矶呈现其三阶级人口高峰约为 1，000~10，000 人/平方米。

The present invention relates to a device (200) for electrically controlling shaping of a light beam.

本发明涉及一种用于电控光束整形的装置(200)。

At present the company's operating condition of the block have a good momentum of development.

目前公司的各块经营状况均有良好的发展态势。

He gave her a bunch of flowers as a present.

他给她一束花作为礼物。

The present is a case in point.

目前我们面对的就是这样一个情形。

One definition of civilization requires that a civilized people have a sense of history -- meaning that the past counts in the present.

按照一些世界上大多数人同意的定义，文明只是一种文化，而且可以说主要是从历史的角度上来定义的文化。

O ne definition of civilization requires that a civilized people have a sense of history -- meaning that the past counts in the present.

"一种关于'文明'的定义有赖于一个文明人要有一种历史感——即把对过去的认识带入到当下。"

Cluster is a basic characteristic of industrial organization at the present time.

产业集群是当今产业组织的基本特征之一。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。