He was immersed in music.

This lake is very deep.

Shin sleeps well in bed.

You need a sleeping bag when you sleep in the mountains.

Protein-degrading enzymes play a role in breaking down unnecessary proteins in the body.

Demography is an important tool for understanding various aspects of society.

I used an optical microscope for an experiment at school.

I mainly use public transportation facilities for commuting.

He had a throat problem, and it was found that his posterior cricoarytenoid muscle was not functioning properly.

He wrote his name using the character for 'work'.