肌梭是骨骼肌内一种重要的本体感受器，参与肌紧张的维持和对随意运动的精细调节。
Muscle spindle is an important proprioceptor in the skeletal muscle, which contributes to the maintenance of muscular tension and the fine modulation of voluntary movements.
这时装置底部会产生，很薄的二氧化碳气体层，这样能在二维上随意运动。
And therefore under this thing comes a film a very thin layer of carbon dioxide and now you can move this around in two dimensions.
20年前，孩子们的体育运动是无组织的，只是在校园或公园里的普通而随意的游戏。
Two decades ago, sports for children were often unorganized, with pick-up games common in schoolyards and community parks.
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