麦当劳乐园指麦当劳世界的乐园，里面有我们记忆犹新的麦当劳人物麦当劳叔叔，奶昔大哥，汉堡神偷，小飞飞。
根据康奈尔大学食品与品牌实验室的一项新研究，小小的非食品奖励——比如麦当劳开心乐园餐中的玩具——同样能刺激人的大脑反应中枢，就像食物那样。
According to a new study from Cornell University's Food and Brand Lab, small non-food rewards—like the toys in McDonald's Happy Meals—stimulate the same reward centers in the brain as food does.
最受欢迎的开心乐园餐玩具是麦当劳发放的超过1亿个迷你豆豆娃。
The most popular Happy Meal toy ever was when McDonald's gave out more than 100 million Teenie Beanie Babies.
麦当劳称：从2008年起，美国消费者购买了100多万份包含苹果片的开心乐园餐。
Since 2008, U. s. customers have purchased more than 100 million Happy Meals with apple dippers, McDonald's says.
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