The reason for this is easy to recognise: in nature, the existent organisms either adapt or are regularly replaced by new types.

原因很容易理解：在自然界中，现存的生物要么适应环境，要么被新物种取代。

youdao

The existent stone ruins, vestige of a traditionalhouse and the lot's configuration, were the main aspects for the new project.

现存的石头遗迹，一个传统房屋的遗址以及这块地的配置都是这个新项目的主要方面。

youdao

If it were only for the sake of an idea Copernicus would have smashed the existent macrocosm and Columbus would have foundered in the Sargasso Sea.

如果仅仅是为了一个观念，哥白尼本会砸烂整个现存宇宙的，哥伦布也会葬身马尾藻海。

youdao

As far as addiction goes, start looking more,again, at some of the treatment opportunities,options, because they seem to be largely non-existent right now."

VOA: standard.2010.06.23

He says the possibility of other mistakes in the report is minimal, or non existent.

VOA: standard.2010.01.23

The network was flawed, the support non-existent, the sales channel disorganized.

FORBES: Apple vs. AT&T: Turning The Tables.

In developing countries where the electricity grid is either inefficient or non-existent, the market for renewables is particularly promising.

ECONOMIST: When virtue pays a premium | The

Those lamentations could provide comfort to Fed officials worried about deflation, since it appears that inflationary expectations are alive and well despite the fact that inflation has been virtually non-existent for the last couple of years.

FORBES: Currency Debasement Is A Beggar's Banquet