MDD is suffering from two limitations. First, the model represents a point-in-time snap shot of the business logic, there are many gaps that people have to fill as they translate it into code.
MDD正遭受两方面限制：首先，模型业务逻辑代表一个瞬间(point - in - time)快照，在人们将其翻译成代码的过程中，存在很多人们必须填补的空白。
The study comprises two parts: In the first part, the author uses the modified SERVQUAL model for a survey to identify service quality gaps as recognized by hotel guests.
实证研究由两部分组成：第一部分是利用修正后的SERVQUAL模型，编写和发放调查问卷，从顾客角度调查饭店服务质量的差距；
By analyzing the vibration model of two-dimensional (2d), the elastic wave band gaps of 2d were calculated and the connection of the elastic wave band gaps with material characteristic was studied.
从二维周期性结构的振动方程出发，建立二维带隙计算模型，并在此基础上分析带隙与材料结构特性的关系。
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