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。
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.
他们想锁定矿石供应来源。
印度计划将中东以外的石油供应来源多样化。
India is set on diversifying supply away from the Middle East.
应用推荐