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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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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.  |
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