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Prices fluctuate, in response to harvests, natural disasters and political instability; and when they rise, it takes some time before new sources of supply become available.
价格会随着收成、自然灾害和政治不稳定而波动；当价格上涨时，需要一段时间才能找到新的供应来源。
They want to lock in sources of supply.
他们想锁定矿石供应来源。
The embargo caused America's customers, especially Japan, to look elsewhere for sources of supply.
ECONOMIST: Export restrictions
High fuel prices may fall as new sources of supply are exploited to fill rising demand from Asia.
ECONOMIST: A survey of The future of energy
Not only would China want to be sure it had other sources of supply if Iranian oil dries up.
ECONOMIST: Banyan
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