The fortification of the city took several years to complete.

If she can run a marathon, a fortiori, she can easily finish a ten-kilometer race.

They are strong and intelligent.

We need to fortify our defenses to be ready.

Fortune favors the bold.

Aqua fortis is an acid used in etching.

Etchings are engravings made on metal plates.

The strong nuclear force is one of the four fundamental interactions of nature.

The strong nuclear interaction holds the protons and neutrons together in the atomic nucleus.

He built a makeshift shelter in the forest.