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.

His sword had a two-character inscription.

He was criticized for having a double standard.