科英阅读课件.pptVIP

Chapter 1  Parts of Speech I. Articles 如果把电压(voltage)加到电路(circuit)的两端，在电路中就会有电流(current)流动(flow)。 If a voltage is applied to [across] (the) two ends [terminals] of a circuit, an electric current will result [flow] in the circuit. Their special positions Six seconds is too short a time for the capacitor（电容器） to become fully charged（充满电）. 这是一台如此灵敏的安培表以致于它能测出电流的微弱变化。 This is so sensitive an ammeter that it can measure the slight change in [of] current. 我们得确定提起这块石头需要一个多大的力。 We have to determine how large a force is required [needed; necessary] to lift this stone. Special habitual uses of the indefinite articles before uncountable nouns (especially to express the idea of “。。。一下；作一。。。”) An increase in pressure always causes a decrease in volume. There is a growing awareness that it is urgent to reduce global warming. II．Prepositions Complement：mostly the “as-phrase” required by many verbs define A as B regard A as B refer to A as B speak of A as B This parameter（参数）is defined as the ratio of signal to noise. Prepositional object --- only after a few prepositions, such as “from★, except★, to, … The energy from within the earth can be exploited. The highest order（度）of accuracy obtainable in using this technique is to within 0.01 percent. Some meanings of the prepositions in common use “by, for, with, in, of, on [upon], over★” by This equation can be solved by the method mentioned above. The two parallel conducting plates（平行导电平板）differ in potential（电位）by one volt. for For x1, this inequality（不等式）holds. For a given length L, cosθdecreases as the time is made shorter. [“in the case of”; “if”. ] Now let us solve Equation (4 - 10) for F. with As current passes, the emf（电动势）of a dry cell（干电池）falls with rapidity. With a higher frequency we can use a smaller antenna（天线）. With no signal input, there will be no ac output. [ “对于；如果；在…情况下“] With a telescope, one can see objects far away. [ “有了；使用”. ] This parameter va