以下为句子列表：
英文: Copper prices, which reached record highs last week, fell back on Wednesday after China's State Reserve Bureau failed to sell all of the metal it put up for auction this week.
中文: 上周创下历史新高的铜价周三回落，之前中国国家物资储备局未能在本周的拍卖会上出售全部的铜。
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英文: Copper prices, which reached record highs last week, fell back yesterday after China's State Reserve Bureau failed to sell all of the metal it put up for auction this week.
中文: 国储局还宣布了在接下来几周出售更多铜库存的计划，以平息人们对中国履行交割义务的担忧。中国需要在下月将大量铜拿到国际市场上交割。
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