Since the muscles in the abdomen and lower backplay an important role in preventing collapse, move the navel toward the spine and lift the sacrum away from the lumbar spine.
此过程中，腹部和下背部肌肉的作用非常重要，所以你需要将肚脐内收，同时把骶骨向上提。
2
That is why technology companies are partnering with educators to bring back good, old-fashioned play.
这就是科技公司正在与教育工作者合作，复兴优秀的老式游戏的原因。
3
It would be a pity to retard our development by holding back those people who are gifted enough to work and play well with less than the average amount of sleep, if indeed it does them no harm.