He received a threat letter.

He is troubled by his obsession.

I saw a gray-haired old man playing with his grandson in the park.

He often takes things out of context, leading people to misunderstand.

He chose to discard the shadow for the substance.

His cooking skills are among the top five.

She is respected as the first lady of the country.

He solved the complex problem as if cutting the Gordian knot.

This chemotransmitter plays a crucial role in transmitting information between nerve cells.

Chemotransmitters play an important role in the transmission of information between nerve cells.