the european eel's migration to the sargasso sea to spawn is one of nature's great unsolved mysteries.

here are ten such historical unsolved mysteries, to both entertain you and make you wonder.

这里就有十个既能愉悦你，又能让你产生求知欲的谜团。

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for the explanation of two problems, the experts have many doubts and unsolved mysteries.

对于这两个难题的解释，学术界尚存许多疑惑与未解迷题。

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over the past several decades, the u.s., canada, and europe have received a great deal of media and even research attention over unusual phenomena and unsolved mysteries.

过去几十年里，美国，加拿大和欧洲都对异常现象界未解之谜给予了大量来自媒体甚至研究机构的关注。

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new scandium oxide extraction process

氧化钪提取新工艺探讨

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technology of extracting scandium oxide by primary amine

伯胺萃取法提取氧化钪的工艺研究

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study on the technology of extracting scandium oxide from tungstenic slag

从钨渣中提取氧化钪的工艺研究

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master layout covering the social sciences, management sciences and humanities such as the three disciplines.

硕士点布局覆盖了社会科学、管理科学和人文科学等三大学科门类。

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create layouts for slides, handouts, and notes using the master layout dialog box in slide master view.

使用幻灯片母版视图中的“母版版式”对话框创建幻灯片、讲义和备注的版式。

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because a supercable would use hydrogen as its cryogenic coolant, it would transport energy in chemical as well as electrical form.

由于超级电缆使用氢做为低温冷却剂，因此不仅可输送电能，也可输送化学能。

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the anomaly is named to be an unsettled scientific problem that scientific epistemological subject ( scientists or scientific workers) queries and rejects the existing theories during the course of the development of the scientific theories.

反常是指在科学理论发展过程中，科学认识主体（主要是科学家或科学工作者）在拒斥已有理论的前提下，对已有理论提出质疑的有待解决的科学问题。

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thermal transport of solid interfaces is a frontier of micro-scale heat transfer, and also a key scientific problem in applied superconductivity, special thermal control, and heat dissipation of microelectronic systems and nano-devices.

固体接触界面热输运是微尺度传热学的研究前沿内容，也是超导应用、空间热控、微电子系统及纳米器件散热等领域亟需解决的关键科学问题。

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for the problem, in this degree thesis, an impactful method is presented to analyze cracked structures, to reveal the cracking mechanism and to study the key scientific problem for the reinforcement of cracked structures.

本文尝试提出一种有效的方法并对含裂纹结构的问题进行分析，揭示其机理，研究含裂纹结构加固过程中的关键科学问题。

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as the development of laser technology, the interactions between laser fields and condensed matters become an important scientific problem. it is of particular interest to investigate their influences on electronic transport properties of mesoscopic systems.

随着激光技术的长足发展，激光与物质的相互作用已成为一个重要的科学问题，特别是激光对介观体系电子输运性质的影响这一问题引起了人们的很大兴趣。

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by integrating the potential of internet sharing and collaboration, a new opportunity is provided to satisfy the requirement of knowledge reuse and large scale computing that exist throughout the whole scientific problem solving process.

把传统的科学问题求解环境同网络的共享与协同特征相结合，为满足科学问题求解过程中普遍存在的知识复用与大规模计算的需求提供了新的机遇。

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analysis of surrounding rock stability, failure mode, failure pattern and its controlling technique of roadway in fully-mechanized sub-level caving mining face is one of key scientific problem in coal mine supporting.

综放工作面回采巷道的围岩稳定性评价、破坏模式、破坏规律以及其控制技术研究是煤矿支护中的关键科学问题之一。

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the coordination of energy utility and environmental compatibility has become a global significant scientific problem; how to effectively use industrial waste heat and improve energy utilization, have been more and more concerned.

能源利用与环境相容协调问题，已成为全球备受关注的重大科学难题；如何有效回收和利用工业生产中产生的低温余热，提高能源利用率，越来越受到人们的重视。

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this paper is concentrated on the ethical and scientific problem on the production and use of fbs, reduction of fbs and development of alternatives to fbs.

本文就胎牛血清生产和使用中的伦理和科学问题以及减少胎牛血清和开展血清替代物研究等问题进行了阐述。

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with the ever-increasing microminiaturization of integrated circuit, metal film interconnect reliability under multi-physical fields has become a more and more important scientific problem.

随着集成电路的日益微型化，金属薄膜内连导线在多场耦合环境下的可靠性成为越来越重要的科学问题。

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solving scientific problem also needs to utilize various forms and methods of thought comprehensively, and its general process and principle method are supposing, predicting and verifying.

解决科学问题也需要综合运用各种思维形式和方法，而它的一般过程和原则方法是假设、预言和验证。

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the study of the mechanism and accumulation of multiple minerals coexisting in one basin is becoming an important basic scientific problem at the scientific frontier of energy subject.

盆地内多种能源矿产共存富集成藏（矿）的成因联系和分布规律的研究，是能源学科的发展趋势和前沿研究的一个重要方向。

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