参照系

It is concluded that, first, geochemical data of the surface soils can clearly distinguish two kind of soils, that is, juvenile soils, for example, purple soils, which inherits most geochemical characteristics of the parent rocks or materials, and anthropic soils, the geochemical characteristics of which have been greatly changed as the results of intensive impact from variety of agricultural uses. Second, different soils have typical indicator elements association respectively due to different parent rocks or materials and utilization, such as purple soils, yellow soils (low alkali and alkaline-earth metal contents and pH value), paddy soils (high organic element and heavy metal elements contents) and fluvo-aquic soils (high rock-forming accessory mineral elements contents) and so on. Consequently, it can be suggested that elements association is an important indicator for two key factors (parent materials and anthropic activities) of soil classification. Third, some differences exist between soil genesic classification and result of cluster analysis, because geochemical characteristics of surface soils can not completely represent the foundation applying to soil genesic classification, that is, condition and process of soil-forming, and soil property.

结果表明：浅层土壤的地球化学数据能较好地用来区分两类土壤，即紫色土一类的幼年土壤（在很大程度上继承了母岩、母质的地球化学特征）和受强烈人为活动水耕、早耕熟化的土壤（外来物质的不断加人显著地改变了浅层土壤原有的地球化学性质）；(2)各类土壤因母岩母质和利用方式不同，各具明显的标志性元素组合特征，如紫色土、黄壤（低碱和碱土金属元素和pH值）、水稻土（高有机元素、肥料元素和重金属元素）和潮土等，因此，这些元素组合是土壤分类两个要素的重要参照系；(3)浅层土壤的地球化学特征不可能完整地体现成土条件、成土过程和土壤属性这三个发生分类依据，因此，聚类分析结果与发生类型之间存在一定的差异。

In these articles, I will provide a frame of reference for understanding biodynamics.

在这些文章中，我将提供一个参照系理解生物力学。

Chapter one deals with Boorstin\'s pragmatism with John Dewey and William James\'s pragmatism as reference.

第一章以詹姆士、杜威代表的美国实用主义哲学为参照系，讨论了布尔斯廷史学思想所表现出的实用主义哲学观。

Chapter three explores the four features of Boorstin\'s social political view---conservatism, that is, the providential thought of a naturalist, anti-rationalism skepticism, constitutional politics and a historical democracy.

第三章以进步学派为参照系，考察了布尔斯廷的社会政治观——保守主义的四个鲜明特点，它们是：自然主义的"天意"观、反理性主义的怀疑论、宪政至上和具有"历史感"的民主观。

It is particularly important to understand forces that act in a reference frame in circular motion .

特别重要的是，我们一定要搞清楚在作圆周运动的参照系中起作用的那些力。

Below we discuss the case of rotating frame in which the fictitious force depends on the position in the frame.

在后面我们还要讨论转动参照系的情况，在那种情况下，虚设力与物体在参照系中的位置有关。

Usually set up Newton's first law of inertial frame of reference as a frame of reference, so this law is defined in practice this important concept of inertial frame of reference.

通常把牛顿第一定律成立的参照系成为惯性参照系，因此这一定律在实际上定义了惯性参照系这一重要概念。

A dynamic process occurring in an isolated system at rest in the frame S was verified in the frame S' moving relative to the frame S, whether at the same instant of the frame S or at the same instant of the fame S', neither of the dynamic results satisfied the requirement of the law of conservation of momentum.

对于一个在S参照系中静止的孤立体系发生的动力学过程，在与S参照系相对运动的S'参照系中检验时，无论是在S参照系中的同一时刻，还是在S'参照系中的同一时刻，这个过程的动力学结果都不满足动量守恒定律的要求。

Then it has established the index system to assess and quantitate competitive capability of District Agriculture.

全国平均水平、代表性地区的水平、专家赋予的标准值都可以作为参照系，利用参照系可以将各种不同形式的指标进行标准化，转换为相互可以比较的指数化指标。

An inertial frames one in which any isolated body is unaccelerated.

惯性参照系，任何孤立物体在这种参照系中都没有加速度。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。