以上来源于: WordNet
N a plant community that does not allow for further colonization, all the available niches being occupied 闭锁植物群落 [ecology]
Why stay within a closed community when you can roam outside its walled garden, into the wilds of the internet proper?
当你能够漫步到花园的围墙外进入到广阔的互联网时，为什么还要待在那个封闭的区域里呢？
Typically, a closed community site or extranet site like this presents an unauthorized user with a login page instead of the home page.
通常，完整的社区站点或外部网站点会向未经过身份验证的用户显示一个登录页面，而不是主页。
For example, in this outbreak, person-to-person transmission cannot be traced back to a traveler, or a single closed community such as a school or workplace.
例如，在这一突发事件中，人与人之间的传播不能追溯到某一个旅客或单一的社区如学校或工作场所。
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