Concentration
There was a man who went out to eat, he was also kind of very greedy, and when he came back, his wife asked him, "So, did you have a good time? Who was sitting at the table to eat with you today?" So, the man said, "I don't know. When I lifted my head they were all gone!"专心有一个很贪吃的人出去吃东西，当他回家，他的太太问他：「好玩吗？今天你和谁坐同一桌？」那人回答：「我不知道，当我抬头时，他们都走了！」