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At the same time, the characteristic equations of the controlled systems with time delays are transcendental equations and belong to infinite dimensional systems, so it is difficult to study the time delay systems in mathematics theory and also difficult to obtain good performance for the time delay systems using the controller designed by classical control theory.

同时，由于含有时滞的控制系统的特征方程是超越方程，属于无穷维系统，对时滞系统的研究在数学理论上是非常困难的，有很高的理论价值，而且通过经典控制理论设计出来的控制器对时滞系统很难得到良好的控制效果。

However, the right ventricule has a crescentric shape, with a separate infundibulum and prominent trabeculations, it is difficult to describe the right ventricule by a simple geometric figure and therefore, difficult to assess its function in a conventional two-dimensional echocardiography.

另 卜，肺动脉高压（Pulmon叼 hypertension，PH）是左向右分流型CHD如ASD常见的并发症之一，PH的存在与否及其严重程度与先心病治疗决策、手术疗效及临床预后密切相关，但先心病合并肺动脉高压的发病机理仍不清楚，尚待进一步研究和探讨。

Finally, because open source software all-time prosperity, the link with the most difficult industry of processor of framework of intromit blame X86 -- the difficult problem that software lacks gets alleviating.

最后，由于开源软件空前繁荣，使进入非x86架构处理器产业最困难的环节——软件缺乏的难题得到缓解。

Adverse food reactions are more difficult to treat as it can be difficult to isolate the precise ingredient responsible for causing itchiness in your dog.

不良食物的反应是更加难以治疗，因为它可能难以孤立的确切成分，负责造成itchiness在你的宠物狗。

One difficulty settings there are three menu items, namely a low degree of difficulty, difficult and difficult to provide the whereabouts of different speed keyboard up and down arrow keys to control the box about the whereabouts of the position and shape.

其中难度设置中有三个菜单项，分别为低难度、中难度和高难度，提供不同的下落速度；键盘的上下左右方向键控制方块的下落位置和形状。

It is only equipped with a caliber 25 mm M242 cannon, 7.62 mm coaxial machine gun 1, 7.62 mm caliber fixed machine-gun turret at the top of a difficult pose a threat to armored targets on the battlefield, so the "Kodiak Bear" armored vehicles fire difficult to adapt to the needs of the battlefield.

它只装备有口径25毫米的M242机关炮、7.62毫米口径共轴机枪一挺、7.62毫米口径顶部炮塔固定机枪一挺，难以对战场装甲目标构成威胁，因此，"科迪亚克熊"装甲车的火力难以适应战场的需要。

According to legal experts, it was difficult to litigate a sex discrimination suit because the vague legal definition made it difficult to quantify damages, so very few cases were brought to court.

据法律专家，很难提起诉讼性别歧视诉讼，因为法律上的定义模糊，难以量化损害，因此极少数情况下被带到法庭。

Mourinho said: If our game against Macclesfield was difficult, against Wycombe it will be even more difficult.

o/ r 穆里尼奥说：如果我们在对阵马格斯菲特时很艰难，那么对阵维康比将会更困难。

This kind of language that I say is quite difficult, it is difficult to want than machine language.

我说的这种语言相当难，比机器语言都要难。

In addition,to find the matchable marrow and hematopoietic stem cell is also quite difficult,therefore ,the majority of acute leukemia patients difficult to obtain good treatment.

此外，为了找到匹配的骨髓和造血干细胞，也是相当困难，因此，大多数的急性早幼粒细胞白血病患者难以得到良好的治疗。ok！

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。