句子是表达思想感情的最小语言单位，正象词是构成句子的基本材料一样，它是构筑段落、文章的基本材料。段落、文章是由无数个句子组成的，因而句子的优劣对段落和文章会产生直接的影响。就修辞角度看，构成一个好的英文句子的基本要素却没有变。即：统一性、连贯性、重点突出 Sentence is the smallest linguistic unit to express thoughts and feelings. Just as words are the basic materials that make up a sentence, it is the basic material for building passages and articles. Paragraphs, articles are composed of countless sentences, so the pros and cons of the sentence will have a direct impact on paragraphs and articles. From a rhetorical point of view, the basic elements that make up a good English sentence have not changed. That is: unity, consistency, focus