以下为句子列表：
英文: A better method is to use purchasing-power parities (PPP), which take account of price differences.
中文: 一种更好的方法是以购买力平价(PPP)计算，它考虑到了价格差异。
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英文: A. Both parities should abide by the contract and should refrain from revising, canceling, or terminating the contract without mutual consent.
中文: 双方应信守合同，未经双方一致同意，任何一方不得擅自更改、解除和终止合同。
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