by nature

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

这个溪谷大可能是自然出现的。

I'm not violent by nature .

我生粗暴。

I'm very lazy by nature.

我生性很懒惰。

He is timid by nature.

他生性胆小。

Tigers are cruel by nature.

老虎生性残忍。

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.

而这切都是个本身没有天空的天空下发生的，太阳点也沉落地沉落点也隐藏地隐藏朵非自愿的云团背后。