He makes it a habit to run 5 kilometers every day.

The luster of that pearl is very beautiful.

The children are playing in the schoolyard.

He keeps an attack dog to protect his house.

We attended the school assembly in the auditorium.

The police collected evidence from the crime scene.

A unary operator operates on one operand.

He spends a lot of time on public works.

Due to the skin effect, the current mainly flows on the surface of this wire.

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