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.

She described the pain of a broken heart as tears.

He has no knowledge about anal sex.

I don't know a thing about him.

He emphasized his belief by saying, 'I believe in order to understand.'

That theory is unscientific and has no evidence at all.

He is an expert in computer science.

The Ministry of Education is responsible for Japan's educational policy.