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Keywords can be considered as a set of words which are important and subject correlated cohesively in a document. Therefore, an automatic keyword extraction method based on density clustering is proposed in this paper. Web pages are segmented, and the words are clustered based on their co-occurrence. Co-occurrence relations between words are analyzed, and keywords that capture the main topics of the document are extracted.
由于关键词是文章中较重要且主题关联较凝聚的词的集合，因此提出一种基于密度聚类模式的中文新闻网页关键词提取方法，根据词语之间的共现信息，对网页分词后的词语进行聚类，在分析词语关联度的基础上提取出反映新闻主题的关键词。
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We prove that a diagram can be drawn with conicoid sequentially if and only if it can be described by a set of triangular equations of degree less than nine.
同时证明了一个三维几何图形可以用平面、球面和圆锥曲面构造出来的充分必要条件是这个三维几何图形可以用一个三角化的次数小于9的代数方程组来描述。
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In view of the ignition systems used on most vehicles, a new kind of misfire simulation method was proposed and a set of electronic controllably misfire simulation device which is convenient, practical and reliable was designed.
针对大多数车辆上使用的点火系统，提出了一种新型失火故障模拟方式，并设计出了一套方便、实用和可靠的电子可控失火故障模拟装置。
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A set of in situ infrared apparatus which can beoperated at liquid nitrogen temperature is established. The structuralstudies of polyhydride of Ruthenium is carried out from roomtemperature to liquid nitrogen temperature. The structural conversion of〓 between dihydrogen and dihydride is observed firstly. It issuggested that with temperature changing, a fluxional structureconversion between terminal and bridged hydrogen appears. NMR studyand DV-Xα calculation are performed in this paper.
建立了可至液氮温度的原位红外测试装置，进行了室温至液氮温度区间钌多氢化合物的结构研究，首次发现了〓在室温存在分子氢与原子氢的结构流变，发现了新化合物存在随温度变化而出现桥氢与端氢的结构转化；进行了NMR测试及DV—〓计算。
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A set of integrity automatic fire alarming system is the beneficial guarantee of the people's life and property when a high building fire occurs and it's the key of if people can discover the fire quickly and accurately to put it out at the embryotic place of the appearance of fire.
高层建筑的特点决定其火灾的危险性和高层建筑的火灾自动报警系统的重要性，一套完整的火灾自动报警系统是高层建筑发生火灾时人们生命财产的有利保障，是能否快速准确地发现火情，把火灾扑灭在萌芽状态的关键所在。
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A set of integrity automatic fire alarming system is the beneficial guarantee of the people%26rsquo;s life and property when a high building fire occurs and it%26rsquo;s the key of if people can discover the fire quickly and accurately to put it out at the embryotic place of the appearance of fire.
高层建筑的特点决定其火灾的危险性和高层建筑的火灾自动报警系统的重要性，一套完整的火灾自动报警系统是高层建筑发生火灾时人们生命财产的有利保障，是能否快速准确地发现火情，把火灾扑灭在萌芽状态的关键所在。
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The architectural characteristics of high buildings decides the risk of fire and the importance of the automatic fire alarming system. A set of integrity automatic fire alarming system is the beneficial guarantee of the people's life and property when a high building fire occurs and it's the key of if people can discover the fire quickly and accurately to put it out at the embryotic place of the appearance of fire.
高层建筑的特点决定其火灾的危险性和高层建筑的火灾自动报警系统的重要性，一套完整的火灾自动报警系统是高层建筑发生火灾时人们生命财产的有利保障，是能否快速准确地发现火情，把火灾扑灭在萌芽状态的关键所在。
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Enhydra contains a visible modeling tool, a workflow execution service as well as a set of client application interfaces.
Enhydra包含一个可视化建模工具，一个工作流执行服务以及一套客户端应用开发接口函数。
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There are only some principles and guidelines for the design of a WebQuest, and there are no systematical and exercisable design methods. To solve this problem, it's very necessary to put forward a set of systematical and exercisable WebQuest design methods.
为解决这个问题，非常有必要把教学设计的理论、方法与WebQuest这种具体的探究性学习模式结合起来，提出一套细致的、操作性强的WebQuest设计方法。
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If it can be shown, firstly, that exogamous tribes exist, or have existed ; and secondly, that in rude times the relations of separate tribes are uniformly, or almost uniformly, hostile, we have found a set of circumstances in which men could get wives only by capturing them — a social condition in which capture would be the necessary preliminary to marriage . And
如果能够被证明，首先，异族结婚的部落存在，或曾经存在；第二，在野蛮时代分离的部落的关系是一律，或几乎一律敌对的，我们便发现了男人只能靠俘获她们得到妻子的一种环境——劫掠对结婚将是必要的预备的一种社会条件。
- 推荐网络例句
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I can still vividly recall the impressive scenes you gave. You were among my friends and relatives who accompanied me from my house to the seaport and when the porters were slow to show up, you obligingly carried my suitcase for me.
你对我的种种感人情意，使我记忆犹新，那天你随着我的亲友从家里送我上轮船，搬运工迟迟不来，你毅然替我提着皮箱上船。
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St. Nicholas became the patron saint of Russia, where he was famous for his red cape, flowing white beard, and bishop's mitre.
圣尼古拉成了俄罗斯人的守护神，在那里，他以身披红斗篷，留着飘逸的白胡须，戴着主教法冠而闻名。
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Long periods of seeming invincibility. Though some industries or lines of business exhibit characteristics that endow leaders with virtually insurmountable advantages, and that tend to establish Survival of the Fattest as almost a natural law, most do not. Thus, for every Inevitable, there are dozens of Impostors, companies now riding high but vulnerable to competitive attacks. Considering what it takes to be an Inevitable, Charlie and I recognize that we will never be able to come up with a Nifty Fifty or even a Twinkling Twenty. To the Inevitables in our portfolio, therefore, we add a few "Highly Probables."
在所属的产业都被赋予其无可取代的优势地位，大者恒存的自然定律似乎牢不可破，但实际结果却不然，也因此在找到真正的真命天子之前，旁边可能还有好几打假冒者，这些公司虽然曾经红极一时，但却完全经不起竞争的考验，换个角度来看，既然能够被称为永恒的持股，查理跟我早就有心理准备，其数量绝对不可能超过五十家或甚至是不到二十家，所以就我们的投资组合来说，除了几家真正够格的公司之外，还有另外几家则是属于极有可能的潜在候选人。