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.

Binary operation is one of the basic concepts in algebra.

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

Silicon dioxide is a major component of glass and ceramics.

It seems that he is suffering from chuunibyou.

He often behaves strangely because of his 'chuunibyou' (middle-school 2nd year syndrome).

He is showing behavior characterized by 'chuunibyou'.

He was criticized for having a double standard.

These shoes have a double sole and are very durable.