【正文】 text. ?Wellgrounded students can absorb Chapters 4 and 5 in say three weeks. ?What, you may wonder, does 54/74 stand for? ?The author concentrated on what he thought he could do best. 編者主要集中在他認(rèn)為他能寫得最好的那些內(nèi)容上。 Stop bit send by transmitters are always placed in the mark level. 6. 現(xiàn)在我們來考慮一個(gè)包含 8個(gè)信息比特加 4個(gè)控制比特的字符。 ?Neither of the transistors on the table are good. 桌子上兩個(gè)晶體管都不是好的。 7. 每采樣值 8位（碼）的重復(fù)速率比 4位的重復(fù)速率高。同位語(yǔ)與所修飾的名詞之間可以用各種標(biāo)點(diǎn)符號(hào)隔開，這時(shí)同位語(yǔ)可以對(duì)標(biāo)點(diǎn)符號(hào)前的整個(gè)句子進(jìn)行說明。 4. 編碼器是將采樣幅值轉(zhuǎn)換成一組脈沖的單元，它對(duì)數(shù)字傳輸是非常重要的。 ?All the data are not to be checked. ? None of the data are to be checked. 所有的數(shù)據(jù)都不核對(duì)。 No (None of) start bits are placed in the mark level. 3. 我們將字符的起始位設(shè)置成空號(hào)電平，而將字符的終止位設(shè)置成信號(hào)電平。 ?Conversely, substances of small resistivity are good conductors. ?This device consists in fact of five parts. ?Who made the first generator in the world, then? ?An increase in temperature, though, tends to make a gas expand. ?Roughly speaking, microwaves are radio waves whose wavelength is less than 30 cm. ?Velocity, we have noted before, is a vector quantity. ?A few kiloohms will, I believe, be enough. 常用的插入語(yǔ)有： 一般來說， general speaking, 更為重要的是， more important, 最為重要的是， the most important, 人們斷言， it has been claimed, 我們將會(huì)看到， it will be noticed, we can see, 我認(rèn)為， I believe, 確實(shí)， it is true, 我們認(rèn)為， we think, 倒裝句 ?Among the experiments to be conducted is a search for Martian life ?In the drawing are another pair of similar right triangles. ?Before long, out came the water. ?There exists a very important relationship between current, voltage and resistance. ?There has been developed a method for producing vastly more powerful rays. ?Orbiting the nucleus are negatively charged particles called electrons. 英譯漢練習(xí) 1. These forces act on the electrons able to move freely within the wire. 2. The more the spring is stretched, the greater is the force necessary to stretch it. 3. Neutron has a mass slightly larger than that of a proton. 4. In the measurement of time intervals much shorter than a second, the decimal system is used. 5. A method of timing accurate to millionths of a second is necessary. 6. An effect similar to postdeflection（后偏轉(zhuǎn)） acceleration could, it is true, be achieved by inc