The compound eyes of insects are made up of many small lenses.

He expressed dissatisfaction with the result.

He voiced his dissatisfaction with the result.

I went to the doctor because of sinusitis.

My sinuses are blocked, and I have a headache.

My sinuses are blocked and I have a headache.

I wore a hanbok and experienced Korean culture.

He finds it difficult to understand complex sentences.

His secondary role greatly contributed to the success of the team.

We visited a fish hatchery.