...种描述语义分析方法是:确定语 言实体的属性( a t t r i b u t e )或特性,它们必须进行计算并写成属性等式(attribute equation)或语义规 则(semantic rule),并描述这些属性的计算如何与语言的文法规则相关。
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表必需与属性定义匹配,例如,等式表的主数据库键必须也是 Persistent 类的主键。
The table must match the definition of your attributes; for example, the primary database key for the equations table must be the primary key of the Persistent class as well.
在常微分方程论中,微分不等式是研究方程解的各种属性的有用工具。
Among ordinary differential equation equations, differential inequality is a useful tool which helps research on properties of equation-solving.
By the way, that's a very remarkable property of the gravitational force-- the cancellation of the two ms.
顺便说一下,这是重力的一个重要属性,即可以消去等式两边的 m
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