一项在美国癌症研究中心年会上公布的大型研究披露，缺乏运动与人体细胞的不稳定生长之间有着紧密联系。
A major study, presented at the American Institute for Cancer Research annual conference, has revealed a strong connection between inactivity and unregulated cell growth.
传统的运动鞋是要让人站立平稳，而这种圆弧底鞋子则是刻意要让人站立不稳。
Unlike traditional athletic shoes that are built to be stable, rocker-sole shoes are deliberately unstable.
卫生官员说，2004年10月和11月，就脊髓灰质炎在非洲的暴发开展了大规模协调一致的免疫接种运动，自这一最初反应以来取得的进展是积极的，但也是不稳定的。
Health officials say that progress made since the first response to the outbreak in Africa - massive co-ordinated immunization campaigns in October and November 2004 - has been positive but fragile.
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