translation.en: And we do know that in domestic animals and others, when they're play deprived, they don't -- and rats also -- they don't develop a brain that is normal.
translation.zh: 我们都知道，在被驯化的动物里 当他们的玩耍被剥夺时， 他们 -- 老鼠也一样 -- 他们不会去正常的开发大脑。