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。

I'm not violent by nature .

我来并不粗暴。

Tigers are cruel by nature.

老虎忍。

He is timid by nature.

他胆小。

I'm very lazy by nature.

我很懒惰。

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的天的，太阳在那里点也不沉落地沉落点也不隐藏地隐藏在朵非自愿的云团背后。