He was criticized for having a double standard.

His speech was a double negative, making it difficult to understand.

He received training to handle a heavy machine gun.

Doublet is an important concept in linguistics.

He drew the heavy vine bow.

A diphthong refers to the phenomenon where two vowels are pronounced consecutively within a single syllable.

This house is warm even in winter because it has double-pane windows.

We should always remember the power of Kannon in difficult times.

She stood on the stage in a dazzling manner, wearing a Juni-hitoe.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.