要不您如何计算零部件成本增长了多少，或者自动向有价值的客户提供限时折扣，或者计算追溯费用变更的影响？
How else are you going to calculate how much your parts costs have gone up, or automatically give a limited-time discount to a valued customer, or calculate the effect of a retroactive rate change?
而且这也将是全球第一次处理追溯过去很长一段时间的外部成本。
And it will be the first time the globe has tackled the question of externalities over a long time period.
尽管商业化的太阳能电池业务可以追溯到50年以前，但是太阳能板在成本的考量上依旧无法与生物能源相竞争。
Although the commercial solar-cell business dates back almost 50 years, solar panels still cannot compete with fossil fuels when it comes to generating electricity relatively cheaply.
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