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。

I'm not violent by nature .

来并不粗暴。

Tigers are cruel by nature.

老虎性残忍。

He is timid by nature.

他性胆小。

I'm very lazy by nature.

性很懒惰。

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.

而这切都是在个本身没有天空天空下发，太阳在那里不沉落地沉落不隐藏地隐藏在朵非自愿云团背后。