(웃음) 우린 그보다는 좀 더 나아야겠죠. 자 이제 왜 "진동" 설이 흥미로운지 설명해 드리죠. 이 분자들에는, 여러분이 전에 보셨듯이, 기본 요소들을 서로를 연결해주는 스프링이 달려있지요.
(Laughter) We have to go a little beyond that. Now let me explain why vibrational theory has some sort of interest in it. These molecules, as you saw in the beginning, the building blocks had springs connecting them to each other.