根据其定义，实例方法涉及对象状态。
Instance methods, almost by definition, involve object state.
根据其定义，标准反应谱仅仅反映了结构反应谱的均值特性。
According to its definition, the standard response spectrum only reflects the mean property of response spectra of structures.
但是根据其定义，关系数据库非常适合存储不常变化的数据间关系。
However, relational databases are by definition excellent at storing relationships between data that is not likely to change.
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