by nature

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

这溪谷不大可能是自然出现的。

I'm not violent by nature .

我生来并不粗暴。

Tigers are cruel by nature.

老虎生残忍。

He is timid by nature.

他生胆小。

I'm very lazy by nature.

我生惰。

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.

而这切都是本身没有天空的天空下发生的，太阳那里点也不沉落地沉落点也不隐藏地隐藏朵非自愿的云团背后。