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How big should my rollers be?

机译：我的滚筒应该多大？

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摘要

Sizing rollers should be a science based on certain stan-dards. Standards, in turn, are based not on good expenence, but rather on avoiding known cases of bad experience. Any standard that does not border on, and even occasionally cross over into, failure, is too conservative. The concept of "zero defects" is economic nonsense here, as well as in any other industry. For example, airplane wings will very occasionally break ( 1% of all accidents) if the pilot is careless enough to fly into a big enough thunderstorm. To make the wings strong enough so as to never fail would mean the plane would be so beefy and so heavy as to have no extra payload capacity to carry passengers. Zero defects may mean zero profit.
机译：上浆辊应该是基于某些标准的科学。反过来，标准不是基于良好的经验，而是基于避免已知的不良经验。任何不与失败接border而至，甚至偶尔跨越失败的标准，都太保守了。 “零缺陷”的概念在这里以及任何其他行业中都是无稽之谈。例如，如果飞行员不小心飞到足够大的雷暴中，飞机机翼偶尔会断裂（占所有事故的1％）。要使机翼足够坚固以至于永不失效，就意味着飞机将如此结实，如此沉重，以至于没有额外的有效载荷能力来载运乘客。零缺陷可能意味着零利润。

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