translation.en: And I think it's really beautiful how nature has distributed control to really give a lot of responsibility to the spinal cord so that the upper part of the brain doesn't need to worry about every muscle.
translation.zh: 我觉得这真的很美妙 大自然竟然赋予了脊髓 这么重大的责任 以至于脑部高级中枢部分根本不需要担心每一块肌肉