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关投球方面的数据——从肩关节部位手度的速度,到膝盖和手肘的张力。
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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.
髋关节和肩关节采用球窝设计,允许旋转运动,但是关节越灵活,它就越不稳定和脆弱——也是为什么你会看到么多脱臼的肩膀和髋关节置换术的原因之一。