本文探讨了动物玩耍行为的进化意义，指出大脑重量与成长环境的关系，以及动物在玩耍中学习社会角色的重要性。例如，狗通过特定的身体语言表明玩耍意图，使陌生个体能迅速建立互动。然而，关于玩耍的原因和功能，研究者们尚未达成共识。
The heavier the brain, the richer the environment in which the animal was raised
这叫反推
The larger the cage in which an animal is kept, the heavier the animal's brain will become.
这不是重点
Thus, many species have evolved clear signals to delineate playfulness. Dogs, for example, will wag their tails, get down their front legs, and stick their behinds in the air to indicate "what follows is just for play." With messages such as those, even dogs that are strangers to each other can be playing within a few minutes.
由一般到特殊
Although play often resembles aggression, fight, or other purposeful activities, researchers do not agree on the reasons for and functions of play.
这个对应导入部分
Animals such as rats, dogs, deer, goats, and monkeys learn how to be both dominant and submissive during play activities so that they will fit in better with their adult social groups.
这个加了很多无关的
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