지속 가능한 에너지에 관해 책을 쓰고 있었는데 한 친구가 묻더군요. "집에서 에너지를 얼마나 쓰지?" 정확히 몰랐기 때문에 저는 당황했습니다.
I was writing a book about sustainable energy, and a friend asked me, "Well how much energy do you use at home?" And I was embarrassed. I didn't actually know.