查询词典 conservation

At last, some advices on project of water and soil conservation in railroading engineering is put forward.

其中，铁路工程是一项浩大的土木工程，由于在施工程过程中，会穿过各种各样的地貌和地形单元，这势必会给所经之地的环境带来一定的影响。

Conservation and the rational use of land and space resources is the fundamental principle of our urban planning should be applied in urban planning, construction and management from start to finish.

节约和合理利用土地及空间资源是我国城市规划工作的基本原则，应贯彻于城市规划、建设和管理的始终。

So, the species may survive in metapopulation form with the equilibrium of extinction and recolonization. We are interested in the effect of habitat fragmentation on the species, and the adaptation of species to habitat fragmentation, which would be useful for conservation strategy and design of natural conserved region.

栖息地片段化将给生活于其中的物种带来怎样的影响，同时物种又是如何适应栖息地片段化并得以续存，这是我们现在所关注的主要问题，这对探讨物种的保护策略及保护区设计原则具有重要意义。

It is shown that two-component Wadati-Konno-Ichikawa equation, i.e. a generalization of the wellknown WKI equation is obtained from the motion of space curves in Euclidean geometry, and it is exactly a system for the graph of the curves when the curve motion is governed by the two-component modified Korteweg-de Vries flow. At the same time, a n-component generalization to the WKI equation is obtained. Also, starting from the motion of curves, mKdV and its symmetry recursion operator is exhibited explicitly; two- and n-component mKdV systems are obtained. It is shown that WKI systems are gauge equivalent to mKdV systems. The two-component WKI equation admits an infinity number of conservation laws and a recursion formula for the conserved densities is given by considering an eigenvalue problem together with introducing an appropriate transformation.

在二维和三维欧氏空间上，我们从空间曲线运动出发，推导出了mKdV方程以及它的用以生成高阶对称的递归算子；推导出了多元mKdV方程以及二元和多元WKI方程，并证明了WKI系统和mKdV系统的规范等价性；尔后，通过考虑特征值问题，并引入一个恰当变换，给出了二元WKI方程的用以计算无穷多守恒密度的递归公式，从而证明了二元WKI方程的守恒可积性；系统地分析了两种mKdV方程的Painleve性质，并分别给出了两种不同形式的二元和n元mKdV方程的共振点出现的规律。

They come to know that recycling is an important part of the conservation of resources.

他们逐步认识到废物利用是节约资源的一个重要部分。

Long term monitoring and related research are needed in the future for the sake of Red-crowned Crane conservation.

为了更有效地验证本文的研究结果并对丹顶鹤进行保护，还有待于长期监测并进一步研究。

Yancheng Nature Reserve, which is the largest wintering habitat for red-crowned crane in the world and has very important position in the world biodiversity conservation, was chosen as the case study area.

本文以盐城自然保护区为研究地，采用问卷调查和实地访谈的方式，对保护管理权交易在生态、自然条件、生产方式转换及经济等方面的可行性进行了分析。

After comparing the examination result with the common biological indicators, we notice that the organic substances in the samples collected from the mud volcanoes mainly come from land higher plants and the result of the redeposit after washing out the upstream's deposit, this conforms the geographic location in the mountains and the luxuriant plants in the region, hoping this research result can provide reference values for the future land developers, in order to take advantage of the land as much as possible, aw well as a perfect planning and conservation of the mud volcano.

将检测结果与常见的生物指标比对后，发现所取泥火山样品中所含的有机物质主要来自於陆生高等植物及上游沉积物经冲刷后再沉积的结果，这和泥火山的地理位置位於山区且附近植被茂盛是相符合，希望这样的研究结果可提供将来土地开发者参考，对这块土地做最好的利用，并对泥火山做完善的规划与保留。

The effects of reflexivity in historic conservation.

古迹保存的反身性效果。

An then according to energy conservation, tempreture coefficient of refractive index of the material is obtained.

根据能量守恒，得到该材料的折射率温度系数，与公布值比较，验证了本方法的正确性。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。