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.
大多数政治家认识到投资科学和国家经济实力的关系，但对研究资金的投入一直不稳定。
Most politicians recognize the link between investment in science and national economic strength, but support for research funding has been unsteady.
大多数政治家认识到投资科学和国家经济实力的关系，但对研究资金的投入一直不稳定。
Most politicians recognize the link between investment in science and national economic strength, but support for research funding has been unsteady.
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