Researchers can precisely measure previously unquantifiable aspects of pitching—everything from the angular velocity of the arm at the shoulder joint to tension on the knees and elbows.
研究者可以精确地测量出先前无法量化的各种有投球方面的数据——
节部位手臂
动角
的速
,
盖和手肘的张力。
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Hip and shoulder joints use a ball-and-socket design that allow rotational movement, but the more flexible a joint is, the more unstable and fragile it is — which is one reason why you see so many dislocated shoulders and hip replacements.
髋关节和肩关节采球窝设计,允许旋转运
,但是关节越灵活,它就越不稳定和脆弱——这也是为什么
会看到这么多脱臼
肩膀和髋关节置换术
原因之一。