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.

We must strive to protect the natural environment.

Natural numbers start from 0 and continue as 1, 2, 3, 4, 5, 6, 7, 8, 9.