研究表明，当人们按实际使用量付款时，他们使用的能源大约减少了五分之一。
Studies show that people use approximately one fifth less energy when they are billed for exactly what they use.
此模型可以帮助确定软件和数据库基础架构的实际使用量。
This model helps to determine the actual usage of software and infrastructures for databases.
虽然不是非常完美，但这些技术能造成分配内存量和实际使用量之间的实际差异。
While not perfect, these techniques can result in a substantial difference between the amount of memory that is allocated and the amount actually used.
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