Miracles are propitious accidents , the natural causes of which are too complicated to be readily understood ( george santayana 奇迹是有利的事件，是太复杂以致于难于理解的自然原因（乔治?圣塔亚那） 。
The contents of such data sources are frequently very hard to understand , being designed with systems and developers instead of users in mind 此类数据源的内容通常非常难于理解，因为它们的设计初衷是针对系统和开发人员，而不是用户。
This genetic synthesis method is complicated because it ' s still difficult to understand how changing genes can lead to changes in small drug molecules 这种基于基因的合成方法很复杂，因为如何改变一进才能进而导致小分子药物发生改变，这一点还难于理解。
Garbage collection can be one of the more difficult concepts to wrap your mind around , as it isn t always obvious how to debug heap problems 垃圾收集可能是使您感到难于理解的较难的概念之一,因为它并不能总是毫无遗漏地解决java运行时环境中堆管理的问题。
At the same time , complex mappings between models and design functions are difficult to understand and , in practice , impossible to maintain as the design changes 同时，模型与功能设计之间复杂的对应关系会变得难于理解，并且当设计变化的时候，它们将很难维护。
If production code has no need to instantiate many types of this collaborator , then adding that ability will make the resulting design needlessly hard to understand 如果产品代码无需实例化该合作者的多个类型，那么添加该功能将使最终的设计不必要地变得难于理解。
If you are familiar with aop , you already know that code - tangling - mixing code from multiple concerns in a module - can lead to obscure and difficult - to - maintain code 如果熟悉aop ，那么您已经知道代码纠结将多关注点代码混合到一个模块中会导致难于理解和难于维护的代码。
What russian reader has not known an irksome feeling of annoyance , dissatisfaction , and perplexity , when he reads the accounts of the latter period of the campaign of 1812 每当读到关于一八一二年战争最后阶段的记述的时候，有哪一个俄国人不感觉到十二万分的遗憾不安和难于理解的呢？
Without some knowledge of the centuries between the fall of rome and the rise of the medieval papacy , the intellectual atmosphere of the twelfth and thirteenth centuries can hardly be understood 如果对于罗马灭亡与中古教权兴起之间的那几个世纪没有一些知识的话，就会难于理解十二、三世纪知识界的气氛。
" i am a reactionary - so complete a reactionary that my position is incomprehensible to you who live in a veiled lie of social organization and whose sight is not keen enough to pierce the veil “我是个反动分子，一个十足的反动分子，你们生活在一种盖着纱幕的社会组织的谎言之中，你们不够敏锐，看不透那纱幕，因此难于理解我的立场。
