结构推理
All too soon it was over and we left feeling we had just touched a very small part of this fascinating topic. (skim the surface)
【正确答案】All too soon it was over and we left feeling we had just skimmed the surface of this fascinating topiC．
【答案解析】[译文] 一切都结束得太快了，离开时，我们感到我们只不过才触及了这个非常吸引人的话题的皮毛。