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例句 1. They must realize that the depth of this subject is almost to be infinite while both the students’ energy and time are limited. 他们必须认识到，这门学科的深度几乎是无穷无尽的，而学生们的精力和时间却都是有限的。
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2. They argue that since hydrogen can be extracted from many resources including water, therefore the fuel cell engine is a great invention for it is powered by this infinite source of energy. 他们认为，既然氢气可以从包括水在内的许多种物质中提取，那么燃料电池发动机毫无疑问是一个伟大的发明，因为其驱动能量的来源是无限的。
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innovation［ˌinə’veiʃn］n. 新方法；新事物；创新
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例句 Innovation and change are integral parts of modern life. 创新和改变是现代生活不可或缺的部分。
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insight［‘insait］n. 洞察力，洞悉；领悟
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例句 1. We all hope to have a group member who works especially well and has the insight on problems we are facing. 我们都希望拥有这样一位团队成员，他/她工作出色，而且在我们面临的问题上有见解。
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2. The female writer’s novels are marked by insight and finesse. 这位女作家的小说以富有洞察力和巧妙的技巧著称。
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同义 perception（n. 洞察力）
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instrumental［ˌinstrə’mentl］a. 起作用的，有帮助的；乐器的
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搭配 instrumental in 在…上有帮助的，起作用的
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例句 1. The United Nations has played an instrumental role in the eradication of this infectious disease. 联合国在根除这种传染性疾病方面起到了重要作用。
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2. Education has made people become more aware of their potential and reading and writing skills are extremely instrumental to one’s success in this competitive world. 教育使人们能够更好地认识到自己的潜能，而读写技巧则对一个人在这个竞争激烈的世界里获得成功起到极其重要的作用。
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invention［in’venʃn］n. 发明，创造；虚构
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例句 1. Many of the inventions that were designed for space exploration have been adapted to use on Earth. 许多为太空探索设计的发明都被修改并在地球上使用。
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2. Some think the greatest invention was television, while others refute that it should be cars. 一些人认为最伟大的发明是电视机，而另一些人反驳说应该是汽车。
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3. The most basic living requirements are food, clothing and a place to live, along with some intelligent inventions. 最基本的生活必需品包括食物、衣服、居住的地方，以及一些智能发明。
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investigation［inˌvesti’geiʃn］n. 调查，调查研究
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例句 1. I’d invite someone compatible with me to join the investigation. 我希望邀请一位能与我和睦相处的人参与到调查研究中来。
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2. The ongoing investigations indicate that predation is the primary cause of the animals’ death. 正在进行的调查研究表明捕食者是这些动物死亡的主要原因。
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例句 1. We should raise the educational level of the farmers and provide them with better seeds and fertilizers, advanced machinery and equipment, and up-to-date technical guidance. 我们应该提高农民的教育水平，并为他们提供更好的种子和化肥、先进的机械和设备，以及最新的技术指导。
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2. The machinery of democracy is supported by most people. 民主的体制得到了多数人的支持。
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同义 organization（n. 机构）
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maintain［mein’tein］v. 维持；维修；主张；赡养
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例句 1. Every doctor will tell you that enough sleep is the basic factor to maintain good health. 每位医生都会告诉你，充足的睡眠是保持健康的基本因素。
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