头寸的损益情况按当日收盘价计算得出，故变动保证金由清算行或经济商每日收取。
Variable margins are collected by the clearing house daily and the calculation is based on the position's profit and loss from the current day's closing price.
周一伦敦贵金属交易价格最高达每盎司1，604美元，当日收盘价为每盎司1，602美元。
The precious metal rose to $1,604 an ounce in London trading Monday, before ending the day at $1,602.
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