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However the reachability matrix is difficult to get. It is proved that there is no need to calculate the reachability matrix fur a Directed Acyclic Graph.

证明了对于一类特殊的有向图即有向无环图，应用解释结构建模法无须求解可达矩阵亦可保证建模结构化的实现。

Examples… which might be multipled ad libitum , show how difficult it often is for an experimenter to interpret his results without the aid of mathematics.

这些例子……可以无限制地增多，表明没有数学的帮助，实验者要解释他得出的结果常常是多么困难。

"Examples… which might be multipled ad libitum, show how difficult it often is for an experimenter to interpret his results without the aid of mathematics.

"，"这些例子……可以无限制地增多，表明没有数学的帮助，实验者要解释他得出的结果常常是多麼困难。

His difficult journey from unhappy childhood, to weird quasi-adulthood has been told and re-told ad nauseam across the world.

从不幸福的童年，到古怪的类似成年期（不能接受迈的人总是称他为古怪），他的艰难历程在全世界一遍又一遍被讲述。

It was the ad-lib of Pengpeng's, the club former presider that was the best programme. The sudden decision made Pengpeng who had a tongue in his head facing to a big difficult. At last he told the new members that joining in Microsoft club ,your wonder started.

这个环节压轴的好戏是由俱乐部前主席鹏鹏的即兴表演，结果这个突然的决定给平时能言善道的鹏鹏出了个大难题，最后鹏鹏以自己的经验纯纯诱导俱乐部的新人：加入微软俱乐部，你的精彩由此开始！

Physical differences are not so difficult to adapt oneself to as religious, ethical and irrational ones.

比起宗教的，伦理的和不合乎常理的差异来说，物质的差异适应起来不那么困难。

Physical differences are not so difficult to adapt oneself to as religious , ethical and irrational

比起宗教的、伦理的和不合乎常理的差异来说，物质的差异适应起来不那么困难。

The process of adaptation to life and work in a foreign culture, like China, can be difficult.

这是"文化冲击"的阶段；一个困难的，但是很重要的一部分，这些经理对外国生活和工作是一个适应的过程。

So, adding more value to your home is not that difficult.

因此，增加更多价值到您的家不是困难的那。

In Chapter 4 windowed function of data signal processing is introduced and applied to addition theorem, which succeeds in solving the difficult problem: it has a bad result when recursive T-matrix is applied to calculate the wave scattering of electrically large objects and multiple objects in the excitation of TE wave.

在第四章中引入数字信号处理中的窗函数，成功解决了在入射波为TE波时，用递推T矩阵法计算电大尺寸物体或多个散射体时，精度不高的问题。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。