很多基本数据的估算都必然存在一定的投机性，比如，一旦太阳能大规模应用于日常发电，它的成本究竟会是多少，这无人知晓。
Many of the underlying estimates are necessarily somewhat speculative; nobody really knows, for instance, what solar power will cost once it finally becomes a large-scale proposition.
数据驱动框架的主要优势是它减少了为很多类型的应用程序创建测试用例的成本。
The main advantage of a data-driven framework is that it reduces the cost of creating test cases for many types of applications.
很多系统发生故障是由于相对便宜的部件损坏，而它导致的非计划停机而发生的维修费用要比这个部件本身的成本高得多。
Many system field failures occur because relativelyinexpensive parts wear out, causing unscheduled shutdowns with costs that arefar greater than the cost of the part.
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