In this situation, the proverb 'it is best to submit to circumstances' applies.

He is from a tribe in Africa.

He is studying about the uncontacted tribes in the Amazon.

Please go straight on this road.

He spoke to me directly.

His opinions are always direct, and that's part of his charm.

He is a very sincere person.

I should do my duty.

Organic solvents play an important role in chemical reactions.

I was diagnosed with fatty heart by the doctor.