The first and most important characteristic is its natural resistance to fire.

Some individuals may have a natural resistance to a particular infectious disease.

Our people have a lot of natural resistance built into their genetic makeup.

Overcoming a natural resistance to change is a challenge faced by many companies that want to progress.

"And this allows them to build up a natural resistance."

Certain people could have a natural resistance and be mildly affected.

A doctor might say that the person's 'natural resistance' is lowered by the injury.

There is a natural resistance in the developing world to anything that would lower standards of living and create further unemployment.

However, the proportion of trees with a high level of natural resistance seemed to be very low, probably less than 5%.

"Anything they can do to break down your natural resistance."