translation.en: Preschool kids, for example, should be allowed to dive, hit, whistle, scream, be chaotic, and develop through that a lot of emotional regulation and a lot of the other social byproducts -- cognitive, emotional and physical -- that come as a part of rough and tumble play.
translation.zh: 学前班小孩，打个比方，应该允许去潜水，打闹，吹口哨， 叫喊，混乱的，会开发很多正常的情感 以及很多社会副产品 -- 认知，情感和身体 -- 这就都是粗糙和滚动玩耍的一部分。