Her determination is as strong as steel.

Aqua fortis is an acid used in etching.

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

She has always been my strong support in difficult times.

The strongroom is used to store valuable items.

The stronghold is well protected by imposing ramparts.

Roller coasters provide a strong feeling.

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

I am always ready to lend a helping hand to my friends.

She is strong as an ox.