51. Unlike most of the world's volcanoes, they are not always found at the boundaries of the great drifting plates that make up the earth's surface; on the contrary, many of them lie deep in the interior of a plate.
[参考译文] 跟世界上的大多数火山不同的是，它们(热点)并不总是在由构成地球表面巨大漂流板块之间的边界上出现；相反，它们中有许多位于一个板块较纵深的内部。
52. The relative motion of the plates carrying these continents has been constructed in detail, but the motion of the plates with respect to another cannot readily be translated into motion with respect to the earth's interior.
[参考译文] 携带这些大陆板块的相对运动已经能够被详细地表述出来，但是这些板块相对于另一些板块的运动还不能轻易地解释为它们相对于地球内部的运动。
53. As the dome grows, it develops seed fissures (cracks); in at least a few cases the continentmay break entirely along some of these fissures, so that the hot spot initiates the formation of a new ocean.
[参考译文] 暂缺
54. While warnings are often appropriate and necessary--the dangers of drug interactions, for example--and many are required by state or federal regulations, it isn't clear that they actually protect the manufacturers and sellers from liability if a customer is injured.
[参考译文] 尽管警告常常是适当而且必须的--比如对于药物相互作用的危险提出 警告--许多警告还是按州或联邦政府规定要求给出的，然而(我们)并不清楚，如果顾客受到伤害时，这些警告是不是确实可以使得生产者和销售者豁免责任。
55. At the same time, the American Law Institute--a group of judges, lawyers, and academics whose recommendations carry substantial weight--issued new guidelines for tort law stating that companies need not warn customers of obvious dangers or bombard them with a lengthy list of possible ones.
[参考译文] 与此同时，美国法律研究所--由一群法官、律师和理论专家组成，他们的建议分量极重--发布了新的民事伤害法令指导方针，宣称公司不必提醒顾客注意显而易见的危险，也不必连篇累牍地一再提请他们注意一些可能会出现的危险。
56. In the past year, however, software companies have developed tools that allow companies to "push" information directly out to consumers, transmitting marketing messages directly to targeted customers.
[参考译文] 但是，在过去的一年间，软件公司已经开发出工具，使得公司可以直接将信息"推出"给顾客，直接把营销讯息传递给目标顾客。
57. The examples of Virtual Vineyards, Amazon.com, and other pioneers show that a Web site selling the right kind of products with the right mix of interactivity, hospitality, and security will attract online customers.
[参考译文] 像Virtual Vineyards，Amazon．com这样的先驱网站表明，一个将交互性、 热情服务和安全性合理结合以销售同类商品的网址是可以吸引网上客户注意的。
58. An invisible border divides those arguing for computers in the classroom on the behalf of students' career prospects and those arguing for computers in the classroom for broader reasons of radical education reform.
[参考译文] 有些人为了学生的就业前景为教室里放置电脑而辩，有些人为教育的彻 底改革中更为广泛的理由为教室里放置电脑而辩，这两群人之间有一条无形的界线。
59. Rather, we have a certain conception of the American citizen, a character who is incomplete if he cannot competently access how his livelihood and happiness are affected by things outside of himself.
[参考译文] 我们更应该具有的是作为美国公民的某种观念，这个公民人物如果不能很恰当地认识到自己的生存和幸福是如何受到自身之外的事物的影响， 那么其公民特征就是不完整的。
60. Besides, this is unlikely to produce the needed number of every kind of professional in a country as large as ours and where the economy is spread over so many states and involves so many international corporations.
[参考译文] 另外，在我们这么一个大国里，经济延展到这么多的州、涉及到这么多的国际公司，因而要按照数量培养出所需的各类专业人员是不大可能的
61.But,for a small group of students, professional training might be the way to go since well-developed skills, all other factors being equal, can be the difference between having a job and not.
[参考译文] 但是，对一个小部分学生来说，职业教育也是条可取的路径。因为在其他因素相同的情况下，技能的娴熟是得到工作与否的关键。
62. Declaring that he was opposed to using this unusual animal husbandry technique to clone humans, he ordered that federal funds not be used for such an experiment-although no one had proposed to do so--and asked an independent panel of experts chaired by Princeton President Harold Shapiro to report back to the White House in 90 days with recommendations for a national policy on human cloning.
[参考译文] 他宣布自己反对使用这种非同寻常的畜牧繁殖技术来克隆人类，并下令．不准联邦政府基金用于做此类试验--尽管还没有人建议这么做--他还请一个以普林斯顿大学校长哈罗得·夏皮罗为首的独立的专家组在90天内向白宫汇报关于制定有关克隆人的国家政策的建议。
63. In a draft preface to the recommendations, discussed at the 17 May meeting, Shapiro suggested that the panel had found a broad consensus that it would be "morally unacceptable to attempt to create a human child by adult nuclear cloning".
[参考译文] 在5月17日的会议上所讨论的这份建议书的序言草案中，夏皮罗提出，专家组已经达成广泛共识，那就是"试图通过成人细胞核克隆来制造人类幼儿的做法在道德上是不可接受的"。
64. Because current federal law already forbids the use of federal funds to create embryos (the earliest stage of human offspring before birth) for research or to knowingly endanger an embryo's life, NBAC will remain silent on embryo research.
[参考译文] 因为现今的联邦法律已经禁止使用联邦基金克隆胚胎(人类后裔在出生 前的最早阶段)用于研究或者有意地威胁胚胎的生命，NBAC在胚胎研究上将保持沉默。
65. If experiments are planned and carried out according to plan as faithfully as the reports in the science journals indicate, then it is perfectly logical for management to expect research to produce results measurable in dollars and cents.
[参考译文] 如果试验是像科学杂志上的报告所示的那样如实地根据计划规划和实施的话，那么对管理层来说，期待研究能够产生可以用金钱衡量的结果是完全合理的。
