求翻译：Aside from gear ratio, the most important factor that determines efficiency is the contact pattern between worm and mating gears, Manufacturing the reducer housing, and worm and gear subassemblies creates a stack up of tolerances, so the position of the gear-tooth centerline cannot be accurately predicted. Therefore, assemblers must manually measure and adjust the contact pattern by varying the position of shims behind the front and rear bearings on the output gear shaft. This is time consuming and costly, so most manufacturers use statistical analysis to predict shim quantity and location. This provides a reasonably centered contact pattern most of the time.是什么意思？

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