average barter
平均易货
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Given that on average it takes only about two tons of alumina to produce one ton of aluminum, the barter deal may have left Iralco with more aluminum after processing the alumina than it supplied to Glencore.
FORBES: Glencore's Barter Arrangement With Iranian Nuclear Firm
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