He has a deep interest in natural history.

Her smile is very natural, and it feels comfortable.

In philosophy, natural law refers to the moral laws of the universe.

Our town suffered significant damage due to a natural disaster.

The equilibrium length of this spring is 5 centimeters.

He prefers natural foods.

Calculating the natural logarithm is an important part of mathematics.

His car spontaneously combusted all of a sudden.

This wood may spontaneously combust if the humidity is high.

Natural rights are rights that humans have from birth.