He has no knowledge about anal sex.

A glottal stop, or 'せいもんはれつおん' in Japanese, represents a sound like the 'uh-oh' in English.

A glottal sound is a sound that is produced when the glottis is closed.

He is majoring in hydrology at university.

Would you like to observe the stars at the observatory tonight?

The philosophy of Mohism, one of the thoughts of ancient China, advocated universal love and fairness.

He fulfilled his responsibilities as a government official.

We must absolutely obey the orders of the emperor.

He was promoted to a high-ranking position.

In mahjong, the opponent on my right, the lower house, is a formidable enemy.