Mother: I left two pieces of cake in the cupboard this morning, Johnny, and now there is only one piece left. Can you explain that?Johnny: Well, I suppose it was so dark that I didn’t notice the other. 妈妈：约翰尼，我今天早上在橱子里放了两块点心。现在就剩下一块了。你能解释一下吗？约翰尼：嗯，我想是因为里面太黑我没看到另外那块。