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.
它的成本就在乔治城一英亩很多比他们的城市家庭少。
It cost less than their city home on a one-acre lot in Georgetown.
关于成本，旁边的事实，即他们不要浪费了很多昂贵的电费，还必须提到，它的电池往往最后比其他光生成的产品很多。
Regarding costs, beside the fact that they do not waste a lot of expensive electricity, it must also be mentioned that its battery tends to last a lot more than other light generating products.
关于成本，旁边的事实，即他们不要浪费了很多昂贵的电费，还必须提到，它的电池往往最后比其他光生成的产品很多。
Regarding costs, beside the fact that they do not waste a lot of expensive electricity, it must also be mentioned that its battery tends to last a lot more than other light generating products.
应用推荐