The progress of technology from the past to the present is astonishing.

The progress of technology from the past to the present is astonishing.

He is good at playing the huqin.

My dream is to live in the United States of America someday.

He is studying about the history of black people.

He is known as a solitary genius.

He is deeply involved in national affairs.

He was staring into the empty space.

He felt a sharp pain in his groin.

He felt a sharp pain in his crotch.