求翻译：Gear-reducer inefficiency converts power to heat. AGMA (American Gear Manufacturers Assn.) guidelines for worm-gear, helical, and other types of reducers limit the maximum allowable operating temperature to 100°F above ambient, not to exceed 200°F. To stay within these guidelines, worm-gear reducers must he considerably larger than equivalent-rated helical reducers (to dissipate more heat) or rely on auxiliary cooling devices.是什么意思？

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