衍生金融工具：一种合同，其价值随着有关或特定商品或金融工具的价格变动而变化。
Derivative instruments: a contract whose value changes as prices move in a related or underlying commodity or financial instrument.
由于我们所签的是一份标价伸缩合同，价格可以不经事先通知而变动。
As what we have signed is a fix - price contract with escalation, the price can be changed without notice.
除本条第4款规定外，合同价格一经双方确认，即不随市场价格的变动而变动。
Except for the provision of 4 of this Section, once the price is agreed by both parties, it will not change again according to the marketing price.
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