求翻译：所提供给买主的是什么投入要素，当供方所提供的投入要素其价值构成了买主产品总成本的较大比例、对买主产品生产过程非常重要、或者严重影响买主产品的质量时，供方对于买主的潜在讨价还价力量就大大增强。是什么意思？

Provided to the buyer what inputs, when supply-side inputs provided by the buyer of its value constitutes a large proportion of the total cost of the product, the production process is very important to the buyer, or seriously affect the quality of the products the buyer, the supplier For the potent

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What is available to buyers of input factors, when the input element whose value provided by the parties constitutes a buyer product a higher proportion of the total cost, is important to the buyer the production process, or seriously affected when buyers the quality of the product, the supplier for