清华电气工程英语PPT unit 1.pptVIP

文秘英语 陈红美 司爱侠 编著 Electric Basic Concept Unit 1 电气工程专业英语教程 张强华 编著 Contents New Words Abbreviations Phrases Notes Kets to Exercises New Words New Words New Words New Words Phrases Listening to Text A [1] Elements are often identified by the number of electrons in orbit around the nucleus of the atoms making up the element and by the number of protons in the nucleus. Notes 原 句 本句中，介词by的宾语由两部分组成，一个是the number of electrons in orbit around the nucleus of the atoms making up the element，一个是the number of protons in the nucleus。第一个宾语中，making up the element修饰atoms，介词短语in orbit around the nucleus of the atoms做定语，修饰 electrons。be identified by是“通过……鉴别”、“识别”的意思。 元素是通过组成该原子的核子轨道上的电子数及核子中的质子数来区分的。 讲 解 [2] Electrons which are forced out of their orbits can result in a lack of electrons where they leave and an excess of electrons where they come to rest. Notes 原 句 本句中的主语是electrons，谓语是can result in， a lack of electrons where they leave and an excess of electrons where they come to rest是宾语。这个宾语由and连接的名词短语a lack of electrons以及an excess of electrons组成，两个where引导地点状语，在理解时要分清这里面的层次。 电子从轨道移走而造成该原子缺少电子，而移入电子的原子会使电子过剩。 讲 解 [3] Trying to measure even small values of current would result in unimaginably large numbers. Notes 原 句 本句的主语是一个动名词短语trying to measure even small values of current，谓语是动词词组result in，result in不能机械地理解为“导致”，因为“导致”带有明显的感情色彩，理解为“造成”更顺畅。 试图测量电流微小的值将产生难以想象的巨大的数字。 讲 解 [4] They will always be attracted from a source having an excess of electrons, thus having a negative charge, to a source having a deficiency of electrons which has a positive charge. Notes 原 句 本句的主干是they will always be attracted from…to…。having an excess of the electrons, thus having a negative charge两个定语修饰的是第一个source。having a deficiency of electrons which has a positive charge修饰的是第二个source。第二个修饰语虽然没有明显表达出两个定语之间的逻辑关系，但是从第一个修饰语中两个定语用thus连接可以判断出，它们仍然有因果关系：因为缺乏电子，才形成正电荷。所以在理解时要注意这层意思。 讲 解 1) A hydrogen atom has only one electron and one proton. 2) An atom with an equal number of