关于两句英文的翻译

在阅读英文资料时看到两句话，不太理解，请高手帮忙翻译一下！
Applying  the long-short addendum system in designing gears also  decreases the amount of a approach action that

occurs  as the teeth of mating gears are going through the initial stage of their contact. Approach action is more taxing in

terms of wear than the recess action that takes place during the later stage of tooth contact. The elimination of

undercutting and the reduction of approach action are particularly benefitcial when the gears are of plastic.

惭愧,部分不明

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