英语翻译.1．2 专业英语阅读1-2．1 Introduction(引言)We begin our study of t

英语翻译
.1．2 专业英语阅读
1-2．1 Introduction(引言)
We begin our study of the physical universe by examining objects in motion．The study of motion,whose measurement.more than 400 years ago gave birth to physics,is called kinematics．
Much of our understanding of nature comes from observing the motion 0f objects．In this chapter we will develop a description for tile motion of a single point as it moves through space．Although a point is a geometrical concept quite different from everyday objects such as footballs and automobiles,we shall see that the actual motion of many objects is most easily described as the motion of a single point(the“center of mass”),plus the rotation of the object about that point．Postponing a discussion.Let us begin here with a description of a single point as it moves through space．
1.2.2 Space and Time(时间与空间)
Kinematics is concerned with two basic questions,“Where?’’ and ”When”?.Though the questions are simple,the answers are potentially quite complicated if we inquire about phenomena outside our ordinary daily experiences .For example,the physics of very high speeds,or of events involving intergalactic distances or submicroscopic dimensions,is quite different from our common-sense ideas.We will discuss these interesting subjects in later chapters.For the present we shall adopt the space and time of Newton-those concepts we gradually developed as a result of our everyday experiences．
Space is assumed to be continuously uniform and isotropic.These two terms mean that space has no “graininess” and that whatever its properties may be ,they are independent of any particular direction or location．In the words of Isaac Newton．Absolute space,in its own nature,without relation to anything external,remains always similar and unmovable.” Every object in the universe exists at a particular location in space ,and an object may change its location by moving through space as time goes on.We specify the location of a particular point in space by its relation to a frame of reference．
Time,according to Newton ,is also absolute in the sense that it “flows on” at a uniform rate.We cannot speed it up or slow it down in any way．in Newton’s words.Absolute,true,and mathematical time,of itself.and from its own nature.Flows equably without relation to anything external.and by another name is called duration.“ Time is assumed to be continuous and ever advancing,as might be indicated by a clock．

1.2.1引言
我们开始研究宇宙的物理研究物体的运动.运动的研究,其measurement.more比400年前诞生了物理,称为运动学.许多我们对自然的认识来自于观测的物体的运动.在这一章中我们将开发一个描述瓦运动的一个单一的点它在太空中运行.虽然有点是一个几何概念完全不同的日常物品,如足球和汽车,我们应看到,实际运动的许多对象是最容易被描述为一个单一的运动点（“质心”）,加上旋转的物体,点推迟.讨论.让我们从这里描述的单点它通过移动空间.
1.2.2 时间与空间
运动学是有关的基本问题,”在哪里?什么时候?.虽然问题简单,答案可能是相当复杂的,如果我们了解现象之外的普通日常经验.例如,物理学非常高的速度,或事件涉及星际距离或微观层面,完全不同于我们的常识.我们将在后面的章节中讨论这些有趣的科目.目前我们所应采取的时间和空间的概念,我们newton-those逐步发展成为一个结果,我们的日常经验.空间被认为是连续均匀和各向同性的.这些术语的意思,空间没有“粒度”,无论其性质可能是,他们是独立于任何特定的方向或位置.在对艾萨克词的牛顿.绝对空间,其本身性质,不与任何外部,仍然总是相似及不动的.“每一个物体在宇宙中存在,在一个特定位置的空间,和一个对象可以改变其位置在空间中的移动,随着时间的流逝.我们指定的位置,一个特定的点在空间关系的参考框架.时间,根据牛顿,也是绝对的意义上说,它“流”在统一税率.我们不能加快或者减慢在任何way.in牛顿的话.绝对,真实,和数学的时间,就其本身性质的itself.and.稳定地流动与外物无关.和另一个名字叫时间.“时间是假定连续不断推进,可能是由一个时钟.