【正文】 or more AC voltage/current sources of single phrase or multiphase and delivers to a load. The output variable is a lowripple DC voltage or DC current. Many practical ACDC converters use a voltage source with line frequency of 50 or 60 Hz, singlephase. The ACDC converters are widely used from very lowpower battery chargers and DC power supply systems to very highpower DC motor drive system.Keywords：AC TO DC CONVERTERFrom reference 4The DC to DC converter takes power from a DC source (voltage or current) and delivers to a load. The output variable of the converter is one or more lowripple DC voltages or DC currents (often regulated). The DC output voltage may be different in amplitude than the input source voltage. A practical DCDC converter ha either a battery, a solar powered DC voltage source or a line frequency (5060Hz) derived DC voltage source (often unregulated). The DCDC converters are widely used from very lowpower portable electronic systems to very highpower industrial system. The very high power DCDC converter, such as in electric traction, is also referred to as the chopper.Keywords：DC TO DC CONVERTERFrom reference 5The AC to AC converter takes power from an AC voltage or current source and delivers to a load. The output variable is a lowdistortion AC voltage or AC current of an equal or different frequency than the input AC source. The conversion may also involve single phase to multiphase or vice versa. The practical AC controller usually uses line frequency 5060Hz voltage sources, single or threephase. The ACAC converter where the output frequency is lower than the frequency of the source is called the cycloconverter. The output frequency in a cycloconverter is a simple fraction such as 1/3,1/5 and so on of the source frequency. They are used in very highpower industrial applications. The AC to AC converter with no change of frequency is referred to as the AC controller.Keywords：AC TO AC CONVERTER2 中文翻譯及分析出自文獻1：不控ACDC 變換器一般被稱為整流器。說明你的需求，向租讓公司詢問它們的解決方案，安裝電機時，確保其已有效接地，如何接地應(yīng)該一定程度上依靠當?shù)仉娏Ψㄒ?guī)和發(fā)電機上的說明。交流發(fā)電機的額定功率是基于原動機克服電機損耗的能力和發(fā)電機散熱的能力。選擇發(fā)電機時，挑比你所需的額定功率高的，那樣你的發(fā)電機無需全負荷運行（對燃料使用效率不利），或無需冒險，諸如電機卡轉(zhuǎn)或者電機停轉(zhuǎn)（馬達發(fā)電機普遍不能過載），通常計算整個線路的負載（KW），加上至少20%~30%作為安全余數(shù)。 and maximum temperature rise. Generators are perfectly safe provided they are set up and used correctly. If you plan to hire a generator, be sure to hire from reputable pany. They should be able to provide you with suitable cables, and site the generators for maximum efficiency. Define your need and ask the rental pany for their solution. When installing generator, make sure that the generator has a good earth/ground connection. How this earthing should be done depends somewhat on local electrical regulations and instructions on generator.Keywords：generator electromagnetic induction name plate data2 中文翻譯及分析出自文獻1：發(fā)電機是將機械能轉(zhuǎn)變?yōu)殡娔艿脑O(shè)備，它的運行是基于“電磁感應(yīng)”原理的，電線穿越磁場運動，其中產(chǎn)生電流。關(guān)鍵字：質(zhì)子 中子 電子3 長難句分析及專業(yè)詞匯a)、When the balancing force between protons and electrons is upset by an outside force, an atom may gain or lose an electron. When electrons are lost from an atom, the free movement of these electrons constitutes an electric current.“electric current”:電流。一次能源，如煤、天然氣、油、核能以及其它自然能源，轉(zhuǎn)變后可以產(chǎn)生電，一種二次能源，許多城鎮(zhèn)是依著瀑布（一次機械能）而建立的，這些瀑布可以帶動水輪進行工作。電子的負電荷與質(zhì)子的正電荷相等。成績南京工程學(xué)院期末考查報告書電氣工程專業(yè)外語B 院（系、部、中心） 電力工程學(xué)院 專 業(yè) 班 級 學(xué) 生 姓 名 學(xué) 號 任 課 教 師 年 月 南 京 Production of Electrical Energy（電能生產(chǎn)）1 English textFrom reference 1 Electricity is a form of energy. Electricity is the flow of electrons. All matter is made up of atoms. and an atom has a center, called a nucleus. The nucleus contains positively charged particles called protons and uncharged particles called neutrons. The nucleus of an atom is surrounded by negatively charged particles called electrons. The negative charge of an electron is equal to the positive charge of a proton, and the number of electrons in an atom is usually equal to the number of protons. When the balancing force between protons and electrons is upset by an outside force, an atom may gain or lose an electron. When electrons are lost from an atom, the free movement of these electrons constitutes an electric current. Electricity is a basic part of nature and it is one of our most widely used forms of energy. We get electricity, which is a secondary energy source, from the conversion of other sources of energy, like coal, natural gas, oil, nuclear power and other natural sources, which are called primary sources. many cities and towns were built alongside waterfalls (a primary source of mechanical energy)that turned water wheels to perform work. Before electricity generation began slightly over 100 years ago, houses were lit with kerosene lamps, food was cooled in iceboxes, and rooms were warmed by woodburning or coalburning stoves. Beginning with Benjamin Franklins experiment with a kite o