Keijiro is my best friend.

He was working abroad for twelve months.

The Triassic period is one of the geological ages, referring to the period from about 252 million years ago to about 251 million years ago.

He was affected by secondary effects.

This two-dimensional array represents students in each row and subjects in each column.

Binary operation is one of the basic concepts in algebra.

Silicon dioxide is a major component of glass and ceramics.

Your performance was really wonderful.

A fennec is a small fox that lives in the desert.

Her dress was made of beautiful faille.