the preceding contract obligation 先合同义务
preceding contract
之前的合同
以上为机器翻译结果，长、整句建议使用 人工翻译 。
However, in order to take advantage of the sharp increase in iron ore prices in the past few years, miners decided to move to a quarterly contract system, whereby the contracts would be priced based on the average price in the preceding quarter.
FORBES: Rio Tinto Stock Worth $82 Despite Iron Ore Price Volatility
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