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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。

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They want to lock in sources of supply.

他们想锁定矿石供应来源。

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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