He had hallucinations because of his illness.

I felt a deep disillusionment because of his actions.

It is important to calculate the subtrahend accurately.

I could see the beautiful sea from the porthole.

This way of thinking limits our perspective.

He is trying to get a promotion by saying flattering words to his boss.

He is conducting research on natural phenomena.

The Eoarchean eon is the oldest era in the history of the Earth.

The Proterozoic eon is the longest era in the history of the Earth.

This temple has a solemn atmosphere.