Alkali metals are very reactive chemically.

Her ring was adorned with a beautiful topaz.

The calculation of the arccotangent is a part of trigonometry.

A quark is a type of elementary particle, and it is a component of protons and neutrons.

Primates, known as '霊長目' in Japanese, is a classification that includes many mammals, including humans.

During World War II, Japan was part of the Axis powers.

The Austronesian language family is one of the most widely distributed language families in the world.

Dermaptera is a type of insect, characterized by its distinctive pincer-like tail.

I want to go to Cork, Ireland.

You often see crabeater seals in the Antarctic Ocean.