难于理解

• Taditional association rule mining methods lack of focus on the results , and the procedure is slow . those algorithms express the regularities with low level primitive data , and the mining association reules are difficult to understand
  传统的关联规则挖掘缺少挖掘的针对性，挖掘速度慢，挖掘结果难于理解，挖掘结果的数量巨大，需要进行大量的筛选以便抽取出有用规则。
• Most teachers tend to use extrinsic motivation ( like giving any kinds of rewards ) because it is easier to use ; but intrinsic motivation is profoundly important and it ' s relatively difficult to understand and use
  很多教师往往都会运用外部激励的方法（如给予各种各样的奖励） ，因为这会比较容易；但是内部激励的方法更加深远而重要，但相对于外部激励方法来说更加难于理解和运用。
• According to the number of artifacts and the complexities of the system , the development methodology can be divided into the heavyweight methodology and the lightweight methodology . but now , the heavyweight methodology has brought plenty of problems that are difficult to deal with
  但在实际开发过程中，重量型开发方法产生了一系列难以消除的问题，它的许多规则已经难于遵循，很多流程复杂且难于理解。
• The representation of the process of simplification of dfsm is researched , the disadvantage of the linear sequential representation are pointed out , the representation of the process of simplification of dfsm called simplification tree are given , which is intuitionistic and effective
  摘要文章讨论确定有限状态机( dfsm )简化过程的表示问题，指出传统的线性顺序法存在直观性差、层次不分明、难于理解的不足，提出简化树法，它具有直观、有效的特点。
• The traditional modeling method of c4isr communication networks is to construct simulation models for real communication networks directly . this method greatly depends on the modeler ' s experience , which easily causes the model ' s confusing constructs and the difficulties for other modelers to understand
  C ~ 4isr通信网络建模的传统方法是根据现实中的通信网络直接建立其仿真模型，该方法对建模人员的经验依赖性较强，所建模型结构不清晰，对于其它仿真建模人员难于理解。
• But even if we admit that kutuzov and tchitchagov and the others were responsible for the non - success of the russians , it is still impossible to understand why , in the position the russian troops were in at krasnoe and the berezina , on both occasions with numerically superior forces , the french army and marshals were not taken prisoners , if that really was the aim of the russians
  然而仍然难于理解的是，为什么俄国军队在克拉斯诺耶和在别列济纳拥有那些条件俄国军队在这两处均占据优势，而法国军队及其元帅们王侯们和皇帝没有被俘获，而这又正是俄国人的目的，这又是什么原因呢？
• While the augmentation approach generallyresults in higher state dimension and thus high computational cost , especiallythe systems under investigation involves multiple delays and the delays are large . for continuous - time systems , the delayed problems can in principle be treatedby the infinite - dimensional operator riccati equations which are di ? cult to beunderstood and implemented
  然而,当系统有多个时滞且时滞较大时,增广系统将会导致系统维数增加,计算量增大。连续系统的时滞问题通常用到无穷维算子的riccati方程,这种算子方程既难于理解又不便应用。
• During web application development , neither using ttaditiona1 development tools ( such as cgi , asp ) nor using newly jsp . aspnetusually the ui codes would mix with business codes . so it maked the repeating level of developing web application was very high , and it was hard to comprehend . uphold
  在web应用系统的开发过程中，无论是使用传统的开发工具(如cgi 、 asp等) ，还是最新的jsp 、 asp . net ，系统中的用户界面代码和业务逻辑功能代码往往混杂在一起，使得编写web应用程序的劳动重复程度很高，而且这样的代码也难于理解、维护、升级与扩展。
• It makes the movement trace , movement characteristic and reciprocal relationship in the mechanical devices of the new automobile structure appearing according to the speed and visual angle demanded by script designing . some movement phenomena which are difficult to be understood and observed , especially high speed and microcosmic movement are presented repeatedly to learners
  创作了大量的三维动画使汽车新结构中的机械装置的运动轨迹、运动特点、相互关系按照脚本设计要求的速度、观看角度呈现出来，使一些难于理解、难于观察的运动现象，尤其是高速和微观运动，反复向学习者展示。