There are several unwritten rules in this company.

He is looking for literature on that theme.

You can use a spectrometer to examine the composition of a substance.

Spectroscopy is an important means of investigating the properties of matter.

He strongly believes in the value of humanism.

My four treasures of the study are a fountain pen, a pencil, an eraser, and a ruler.

Taxonomy is an important tool for understanding the diversity of life.

What is the sales percentage of this product?

Analytical chemistry is a science that reveals the composition and structure of substances.

He is majoring in humanities at university.