He is still young and ignorant of the ways of the world.

Because he was raised in the countryside, he is completely ignorant of city life.

Chemsex can potentially have a very negative impact on health.

He learned how to use a stone axe in his archaeology class.

He is a frog in a well, not understanding how vast the world is.

He likes to take a walk in the park at dusk.

This artwork is subject to droit de suite.

Um, thanks, for helping me.

He is an expert in petrochemistry.

Sexual abuse is an act that is absolutely not allowed.