【正文】 ts in order to further illustrate or support the main statements. The main statements and the auxiliary statements in place is tandem relations. For example: Si Nan was posed of two parts : a spoon and a tray . The spoon was cut from an intact piece of natural loadstone, with its handle as the south pole and its round , smooth bottom as the center of gravity. The tray ,on the other hand, was made of bronze, and at the center ,there was a round ,smooth groove ,carved with checks and words indicating the 24 directions. This passage, the first sentence is the main statement, the following two sentences are auxiliary statements, to further explain to support the first statement. Finally ,the conclusive statements are the results of technical personnel reasoning and analytic thinking, and sometimes are summed up to the discovery of scientific and technological personnel .In these sentences, inferences must be concise and clear and have a certain depth and breadth of research .For example, the theory of sphereheavens(渾天說 ) played an important part in the history of Chinese astronomy, 福建師范大學(xué)碩士論文 2 exerting significant influence on the design and manufacture of ancient astronomic instruments, as well as on the explanation of relevant astronomic theories. Plenty of studies have shown that the conclusive statements usually appear at the end of the article. Frequent Use of Long Sentences In EST , authors often use long sentences to convey plicated thoughts and logic connections as a functional style. In the English stylistic feature, function attached to the structure. According to the statistics by foreign researchers, the average sentence length is, respectively ,22 , (using word as the unit) in Popular Mechanics, Science Digest, American Science. We can clearly find out that ST English tends to use long sentences, in the most condition, the stronger the academic literature is, the longer the sentences are. argues that, the short sentence is less than 15 words in English for science and technology is not very often to be seen .The sentences in English for science and technology, pared to everyday English and literary English, are more plicated and much longer. Because in EST, the sentences are accurately, objectively, logically structured and conceptually strong. In general, it is appropriate for science and technology workers who are accustomed to reading or specialize in science and technology more and more long sentences are used in EST. In EST stylistics, long sentences often consists of a subject with a number of clauses, the clause with the phrase, mutually dependent and constrained so there exists a plex phenomenon in EST articles that a long sentence often includes another one. Plenty of studies appear that long sentences using in EST stylistics are divided into three kinds of structure: the simple sentence, the plex sentence and parallelism sentence. First of all, in short ,plex sentences is a bination of the main clause and subordinate clause. On the one hand, in EST ,the sentences have much higher demand on the degree of accuracy and precision, on the other hand, pound sentences can not only enhance logic of a sentence but can shorten the length of the sentence. So plex sentences can not be avoided frequent using in EST stylistics. The author will elaborate on the frequent using of plex sentences in scientific English stylistics in the following section. This section, the author mainly analyzes the simple sentence and the parallelism sentence structures in the application of EST stylistics. 1 .Simple sentences. A simple sentence is defined as those sentences that have but one subjectpredicate structure, which constitutes the main part of one sentence. The authors, in this structure of this long sentence in EST ,tend to utilize a lot of adjectives, noun phrases, prepositional phrases, nonfinite forms of verbs and so on to modify the sentence. In the following the author uses an article as an example to illustrates the application of simple sentence： ―We use touch screens everywhere: tourist kiosks, automatic teller machines, pointofsale terminals, industrial controls. Half a dozen vendors, plus inhouse departments at major manufacturers, produced $800 million worth in 2020. The market is growing because the interfaces are easytouse, durable and Chapter One Syntax and Grammar of English for Science and Technology inexpensive. Touch screens employ one of three physics principles for detecting the point of touch. Pressing a “resistive” design with a finger or other stylus raises a voltage. In ―capacitive‖ models, a finger draws a minute current (this method is often used for cursor pads on notebook puters). In other designs, a finger or stylus interrupts a standing pattern of acoustic waves or infrared lights that blanket the surface. Resistive screens are the oldest, most widely used and least expensive, and they work with any stylus (finger, pen). Capacitive screens must be touched by a finger or an electrically grounded stylus to conduct current. Wave screens are the newest and most expensive. Surface acoustic wave screens must be touched by a finger or a soft stylus such as a pencil eraser to absorb energy。 capacitive screens for slot machines。 if the cursor moves between the fingers, it is resistive (the points are averaged). If the unit does not respond to your fingernail, again place two separated fingers against it. If the cursor moves beneath one finger, the unit is acoustic wave。s freedom is secure. To that end we will devote our strength, our resources, and our firmness of resolve. With God39。s important materials and has many beneficial effects such as improving eyesight and cal ming the liver .It contains pectin and is rich in dietary fiber ,which can help digestion. It has a certain nouri