一群小动物在公园游玩,小灰熊跑过来说:“快来看,我花9元钱买的玩具机器人多威武!”大嘴猴说:“这个机器人的确很帅,15元钱卖给我吧!”“好的,你喜欢就卖给你。”小灰熊说。过了几天,小灰熊对大嘴猴说:“机器人我不想卖了,把15元退给你。” A group of small animals to play in the park, the Little Grizzly ran: “Come on, I spent 9 yuan to buy toy robots and more powerful!” Mouth monkey said: “This robot is indeed handsome, 15 yuan sold I am! ”“ Well, you like to sell it to you. ”“ Little Grizzly said. A few days later, the Little Grizzly said to the mouth-mouth monkey: ”I do not want to sell the robot and I will give you 15 yuan. "