Sufficient caution is necessary when handling radioactive materials.

The United Nations Security Council plays a crucial role in maintaining world peace and security.

Due to his somnambulism, he may walk around unconsciously in the middle of the night.

He is undergoing regular medical check-ups due to sickle-cell anemia.

He was diagnosed with agranulocytosis.

The United Nations Security Council plays a crucial role in maintaining world peace and security.

General relativity is a theory of physics proposed by Einstein.

Special relativity is one of the fundamental theories of physics.

This area is seriously contaminated with radioactive isotopes.

He feels dizzy when he stands up suddenly due to orthostatic hypotension.