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

Astrobiology is a very interesting field of study.

He continued his journey to the west.

General relativity is a theory of physics proposed by Einstein.

He is a world-renowned biologist.

We conducted a spectral analysis to investigate the spectral characteristics of this substance.

Chlorofluoromethane is one of the substances that contribute to the destruction of the ozone layer.

He faced difficulties with the spirit of 'one eye, two feet, three gallbladders, four strengths'.

He is receiving treatment for obsessive-compulsive disorder.

Cell biology is the study of the structure and function of cells, which are the basic units of life.