Strontium is one of the elements abundantly present in the earth's crust.

The top quark is the heaviest quark in particle physics.

This bacterium is about 1 micrometre in size.

A femtometer is a unit of length, equal to 10 to the negative 15th power of a meter.

It's 5 kilometers from my house to school.

The thickness of this notebook is about 10 millimeters.

He is known as an eccentric artist.

His eccentric behavior sometimes confuses people.

We are building a new network system.

He chose to discard the shadow for the substance.