水通常是自然形成的地下水，沿着岩石的裂缝渗出；不那么典型的是，水是通过从地表抽水而人工引入的。

The water is usually naturally occurring groundwater that seeps down along fractures in the rock; less typically, the water is artificially introduced by being pumped down from the surface.

youdao

首先是纽约这座城市，在这里出生的男男女女们认为这座城市的存在是理所当然的，认为城市的规模和动荡都是自然形成的，是必定会发生的事情。

There is, first, the New York of the man or woman who was born here, who takes the city for granted and accepts its size and its turbulence as natural and inevitable.

youdao

氟是一种自然形成的矿物质。

Fluoride is a naturally occurring mineral.

youdao

It is just is the way it is, it's natural.

它本来就是这样的,它是自然形成的

耶鲁公开课 - 美国内战与重建课程节选

If somehow you could take your anti-sense molecules that you've made and you could get them into cells, then by this process of hybridization they would naturally form a pair like this.

如果你能得到合成的反义链,并能使它进入细胞,那么通过杂交,它们就能自然形成这样的一对

耶鲁公开课 - 生物医学工程探索课程节选

Nature precedes art and human artifice or human making.

自然先于艺术，人的技巧和人的形成。

耶鲁公开课 - 政治哲学导论课程节选