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介词是学习英语的难点之一,特别在阅读过程中是一个“拦路虎”。介词短语是构成长难句的一个重要因素。介词短语可用作定语、状语、表语和补足语。介词可与动词、名词、形容词等连用。 BGX.U\uc
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这里特别指出一种介词复合结构,with(without)构成的复合结构,这种复合结构的形式有: _+E5T*dk
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(1) If something is moving, with nothing touching it, it will go on forever,coasting at a uniform speed in a straight line. hRD=Y<>A
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(4)The article deals with microwaves,with particular attention being paid to radiolo cation. wnEyl[ac
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这篇文章是研究微波的,其中特别注意无线电定位问题。(with...10cation是分词复合结构,在句中作补充说明。) '
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(1)Maxwell pointed out that an object may be hot without the motion in it being visible. J*yf2&lI5
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(5)The rocket engine,with its steady roar like that of a waterfall or a thunderstorm,is an impressive symbol of the new space age. j-4VB_N@
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在没有阻力的简谐运动中,振动质点的能量由动能变为势能,或由势能变为动能,但总能量不变。(with十名词十形容词的复合结构在句中有结果状语的意味。) $56Z#'(D
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不带电的物体含有大量原子,每个原子通常含有等量的电子和质子,但是有一些电子暂时脱离了原子的束缚。(with+名词+形容词的复合结构,对句子起补充说明作用。) =CK4.
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目前,人们已知的金属大约有80种。由于有这么多的金属可供选择,于是便产生了一个问题:我们将采用哪种金属呢?(with引出的复合结构用作原因状语。)