And he was thinking, "With all the electricity that's out there in the walls, why couldn't some of that just come into the phone so I could get some sleep?"
그 교수는 '잠 좀 자고 싶은데 벽 속에 흐르고 있는 전기를 자동으로 휴대폰으로 옮길 순 없을까?