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 .

生来并不粗暴。

He is timid by nature.

他生性胆小。

Tigers are cruel by nature.

老虎生性。

I'm very lazy by nature.

生性很懒惰。

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.

而这切都是在个本有天空的天空下发生的，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。