translation.en: And in studies of kids playing, it’s been shown time after time that kids who feel secure, who are in a kind of trusted environment -- they’re the ones that feel most free to play.
translation.zh: 研究游戏中的儿童，已经一次次 证明了只要孩子们觉得安心、 是在一种信赖的环境里， 他们就越觉得能尽兴去玩。