He studied history to understand the labor hardships experienced by ancient people.

It's difficult to understand his explanation.

In the park, people were playing happily.

I like to study new languages.

Based on my experience, that method is effective.

I like to experience new cultures.

It's difficult to understand his explanation.

He is working hard all day.

His daily travail is more than we can imagine.

She consoled her friend who was grieving.