演变

The evolution of the European Union environment policy is studied in this paper.

本文对欧盟环境政策的演变过程进行了比较全面系统的分析。

As showed above, we could draw the conclusion that H3 viruses could cause outbreaks or local epidemics in Shanghai for the immune of population to the new emerging antigenic drift was still unknown though there was strong immune barrier to the previous vaccine strain, H1 viruses also may caused epidemics as the population had a weak immune protection to the previous reference strains A/New Caledonia/20/99-like and part of the recent isolates were distingwishing from them and continued to evolute on the new reference strain, and H5N1 HPAI activities has expanded its geographical range thus increasing the size of the population at risk as the continuing emergence of human cases which give the virus an opportunity to evolve towards a fully transmissible pandemic strain. We should keep eyes on the human cases of avian influenza virus an its variation for the H5 isolates in Shanghai also has the possibility to infect human directly and the infection of H5, H9 viruses had previously occurred in the population especially in those contacting with animals.

综合上述分析结果，我们认为上海地区人群虽然对原有的H3亚型参考病毒株有较高的免疫保护，但H3亚型病毒HA已出现新的抗原漂移，人群现在对新变异株的保护水平尚未知，有可能在未来引起局限性暴发甚至地方性流行；人群对H1亚型流感病毒免疫保护水平低，同时H1亚型流感病毒株部分与原推荐疫苗株抗原性差别较大，并在现推荐疫苗株基础上继续变异，需警惕发生流行的可能性；H5N1亚型高致病性禽流感地域范围扩大，人间病例不断发生，存在演变成大流行株的威胁，上海市H5亚型禽流感病毒株存在跨宿主屏障感染人类的可能性，而且已发现人群尤其禽、畜类动物接触人群中存在H5、H9亚型流感病毒的既往感染，应警惕禽流感病毒的变异和人间病例的发生。

It is a key mechanism of evolution .

这是一个关键机制的演变。

In the course of production and evolution of philosophy area, this phenomenon is quite common.

在哲学范畴的产生和演变过程中，这种现象是比较常见的。

First of all, the research of this text is based on summarizing the evolution of developing view.

首先，本文的研究是以总结发展观的演变为基础的。

I hope that this blog will evolve into a wide base of information related to pets.

我希望这个博客将演变成为一个广泛基础的相关信息宠物。

I'm trying my best not to evolve into a just 'that' hired piece of meat!

我想我最好不要演变成一个公正'的'雇佣一块肉！

You need to take a long hard look at your present financial situation and how it is likely to evolve into the future.

你需要花很长的硬看看你现在的财政状况，以及如何有可能演变成未来。

It is often the case that spontaneous ideas evolve into significant, sustainable achievements.

这是通常情况下，自发的思想演变成重要的，可持续的成就。

And how did they evolve into today's international hits?

他们又是如何演变成今天在国际上备受欢迎的剧目？

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。