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.

What is the sales percentage of this product?

This temple has been designated as a national important cultural asset.

This page of the book contains a lot of marginal notes.

He wrote ancient poems using written language.

Intermolecular forces are an important factor in determining the properties of a substance.