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.

Kujō Yoshitsune, the former Prime Minister and Regent of the Go-Kyogoku, played an important role in Japanese history.

He is suffering from post-traumatic stress disorder from the war.

The rectus capitis posterior major muscle is a part of the neck muscles, and it helps in the action of pulling the head backwards.

The rectus capitis posterior minor muscle is a part of the neck muscles, and it helps tilt the head backwards.