英语论文网

如It is(was)…that强调句型、as结构句型、省略句等。(1)It is when an object is heated that the averagespeed of molecules is increased.(2)Speed is defined as the ratio of distance to time.(3)Matter consists of molecules and molecules ofatoms.(在第二个molecules后省去了consist一词)

(六)常用动词现在时

科技英语常用的时态只有五种:一般现在时、一般过去时、一般将来时、现在进行时和现在完成时,尤其是一般现在时更是被广泛使用。科技英语的一般现在时常用来说明普遍真理,阐明科学定理和定义,排除任何与时间牵连的误解,使行文更主动、严密。

三、语篇特点

语篇也就是我们通常所说的篇章,是由一组相互连惯的句子组成的。语篇的语义结构和语篇的课篇机制,即衔接手段确保了语言由句子组成语篇,从而形成了一个有机的整体,所以对这一层面的分析包括了衔接手段和语篇结构。

(一)衔接手段

科技英语作为一种信息交流文体,着重于客观地说明事物的特点和性能,或阐明某种观念、原理、现象等,因而具有准确性、严密性和客观性,在语篇形式上形成了特有的方式———频繁使用词汇衔接和逻辑连接。

1.词汇衔接。词汇的重复出现可以减少语言在传递中产生的歧义,使读者易于正确地理解作者所要论述的客观事实或复杂的认识过程,体现了科技英语的准确性。例:Many stories about the spread ofAIDS are false.You cannot getAIDSworking or attendingschool with someone who has the disease.You cannot getit by touching drinking glasses or other objects used bysuch persons.Experts say no one has gotten AIDS bylivingwith,caring for or touching an AIDS patient.在这个自然段中,多次重复出现关键词AIDS,这不仅使语篇具有连贯性,而且有助于读者意识到有关AIDS的错误认识,从而达到了作者相关信息准确无误地传递给读者的目的。

2.逻辑连接。通过逻辑连接手段的运用,读者可以了解句子之间的语义联系,甚至可经前句从逻辑上预见后续句的语义(胡壮麟,1994)。这充分体现了科技英语的逻辑推理性和严密性。如: https://www.51lunwen.org/shangwuyingyujiaoxue/2011/1119/1602066766.html Mictosutgery is helping to solve all kinds of medicalproblems that had been thought hopeless.For example,doctors can use the technique to restore blood flow to thebrain to prevent strokes.They can reconnect hands andfeet that have been cut off in accidents.And they canreopen parts of the reproductive system so some men andwomen who are not fertile can have children.Eye and eardoctors have used the techniques ofmicrosurgery since the1920s.But it was not until the early 1970s that doctorsbegan to develop a betterunderstandingofthe possibilitiesof microsungery.在这一段落中,本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。