He is immersed in the study of ancient seal script.

Astrocytes are one of the important support cells in the brain.

Oligodendrocytes play a role in supporting the nerve cells of the central nervous system.

He was working on that project round the clock.

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

He is working round the clock.

The Commonwealth of Independent States is an intergovernmental organization formed by part of the former Soviet Union.

This area is seriously contaminated with radioactive isotopes.

In Christianity, God is considered as the Trinity of the Father, the Son, and the Holy Spirit.

In organic chemistry, the concept of cis-trans isomers is important.