迁移的

The immediate concern of new, massive walrus groups for the U.S. Fish and Wildlife Service is danger to the animals from stampedes.

美国鱼类和野生动物管理局担心集体大迁移的海象会发生踩踏的危险。

For thousands of years, man had little impact on the migration of the wildebeests. Now man poses the biggest threat to this spectacle.

几千年以来人类对牛羚大迁移的影响微乎其微，如今却成为这个奇观最大的威胁。

Just why they took so long to travel north is not clear, but many researchers have suggested that the bone-dry Sahara Desert was a major barrier to migrations from the south.

至于人类究竟为什么在这么长时间之后才开始朝北行进，原因尚不清楚。然而，许多研究人员提出，极为干燥的撒哈拉沙漠是自南向北迁移的主要障碍。

Treatment of sucrose alkyl 4,6-orthoacetate hexaacetates I with water or alcohol in the presence of an acid catalyst afforded derivatives of sucrose acetates by selectively blocking specific hydroxyl group in sucrose and acetyl migration.

4，6-原乙酸蔗糖六乙酸酯在酸催化下水解和醇解，选择性地保护了蔗糖分子中的某些羟基，并通过乙酰基由C~4→C~6迁移的异构化反应合成了一系列蔗糖乙酸酯。

The Yangtze and ORDOS cratons with thickened lithospheric roots become as a transitional zone or a firm rock in midstream between the eastern and western parts with different structural characteristics in Chinese continent and obstruct mutual material exchange and migration between the both.

扬子克拉通和鄂尔多斯克拉通厚岩石圈根构成了中国东部和西部之间的交接转换带，成为阻挡东/西部物质交换迁移的中流砥柱。

Based on the predecessors experimental studies on the gaseous diatomic compounds of gold and on the chloride systems, this study approaches the volatile transport of gold related to organic matter in a new experimental system.

在前人已证明金呈气态双分子及金可在氯化物体系中迁移的实验基础上，本项成果在新的实验研究领域对金呈气相富集与有机质关系进行了探讨。

First, the author introduced the general concept of diffusion and infiltration, then, based on the fact that the elements were transported from ore vein into wall-rock during the formation of the veinlets of Dexing porphyry copper deposit,the actual process is simulated by using the expanded one dimension Pick's law.

文章从介绍扩散和渗滤作用一般概念着手，根据德兴铜厂斑岩铜矿床之细矿脉形成过程中元素自矿脉向围岩发生迁移的这一事实，应用扩展的一维费克定律来模拟这一真实过程。

Soil water characteristic curve is one of important parameters for modeling waterflow and solutes transport.

0引言土壤水分特征曲线(soil water characteristic curve，SWCC)是表示土壤水吸力和土壤含水量之间关系的曲线，是模拟土壤水分运动和溶质迁移的重要参数之一。

The migration of radioactive nuclides in groundwater is the one of most important problems in environmental geosc...

放射性核素在地下水中迁移的研究是当前环境地球科学的一个热点课题。

The migration of radioactive nuclides in groundwater is the one of most important problems in environmental geosciences at present.

放射性核素在地下水中迁移的研究是当前环境地球科学的一个热点课题。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。