家禽最容易感染该病,因为拥挤的环境使传播该病毒变得容易。 但野鸟感染病例变得越来越多。
Poultry flocks are worst affected, transmitting the virus easily in crowded conditions; however, the infection of wild birds is also an increasing concern.
气候变化和环境因素会使疾病模式发生改变,可使某些疾病再次出现或者使传播范围扩大,公共卫生系统还必须应对这种改变。
Public health systems must also respond to changing disease patterns resulting from climate change and environmental factors, which may cause the wider spread or resurgence of some diseases.
在新西兰,这种植物传播地很快,它将沼泽地的边缘变成了广阔的盐土草地,并且使利用那片沼泽(生存)的鸟类和动物的数量和种类下降。
In New Zealand the plant has spread rapidly, changing mudflats with marshy fringes to extensive salt meadows and reducing the number and kinds of birds and animals that use the marsh.
So, in order to have fast transmission you do that by transmitting electrical signals; that happens pretty quickly.
所以 为了使信号迅速地传播,细胞使用电信号,它速度非常快
What we're talking about is literariness--that is to say, certain devices that we can identify that perform a certain function -and maybe out of the identification of these devices, to evolve a theory that's more widespread.
我们谈的是文学性,是一种我们能够认知并运用来达到一定目的的策略,我们需要进一步发展这个策略,使这个理论进化并传播。
The barriers to unity presented by European geography and very limited technology made it hard for a would-be conqueror to create a vast empire, eliminating competitors and imposing his will over vast areas.
由于欧洲独特的地理条件,和当时有限的科技水平,使未来的征伐者很难建立一个广袤的帝国,清除异己和使他的意志,传播到广袤领地的每一个角落
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