by nature

It’s unlikely that this gully was produced by nature.

这个溪谷不大可能是自然出现的。

And all this beheath a sky by nature skyless in which the sun sets without setting at all and hides without hiding behind an unminding cloud.

而这一切都是在一个本身没有天空的天空下发的，太阳在那一点也不沉落地沉落一点也不隐藏地隐藏在一朵非自愿的云团背后。

Tigers are cruel by nature.

老虎残忍。

I'm very lazy by nature.

我很懒惰。

He is timid by nature.

他小。

I'm not violent by nature .

我来并不粗暴。