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82. One can readily trace the disappearance of dinosaurs to a major cataclysmic event . 人们很容易把恐龙消失的原因归结为重大的灾难性事件。 83. The reasons for poverty are many , but for the most part center on illiteracy , the lack of opportunities and in some cases pure laziness . 贫困的原因很多，但主要是因为缺少教育、缺少机会，有的情况下纯粹是由于懒惰。 84. Child development depends on a number of factors , both physical and psychological . Correct parental nurturing from infancy through adolescence determines both the physical and mental profile of a mature individual . 儿童的发展取决于很多因素，包括生理的和心理的。从婴儿期到青春期的正确的家长教育决定一个成熟的个人的体质及智力的状况。 85. Factors such as self-confidence and ambition , combined with determination and willpower , contribute to eventual success or failure . 自信、雄心，加上决心和毅力等因素是造成最终的成功或失败的原因。 86. Various factors will weigh heavily on Chinas eventual entry into the World Trade Organization . One centers on the total abandonment of protectionism , and the other on the adoption of generally accepted international accounting norms . 许多因素对中国最终加入世界贸易组织(WTO)有很大的影响。因素之一是彻底放弃保护主义，另一个因素是采用普遍接受的国际会计规范。 | 
