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The influences of composition and structure of catalysts and cracking conditions on catalytic activity are also discussed. Further key study areas in catalytic cracking of tars are presented.

分析了不同催化剂的优缺点及催化机理，讨论了催化剂的组成、结构以及催化裂解条件对催化效果的影响，展望了未来焦油催化裂解的研究重点。

The results showed that the rupture is transcrystalline cleavage cracking by hydrogen embrittlement basically,i.e.cathodic stress corrosion cracking.

指出管件破裂基本上属氢脆引起的穿晶型解理开裂，即阴极型应力腐蚀破坏。

Computation results show that, for the uncracked pavements, low-temperature contracted cracking is not occurred generally, but the temperature-fatigue cracking is able to occur in pavement because of cyclical temperature varying.

在此基础上，对路面温度应力以24小时为周期的变化特征进行了系统的分析，发现了初始应力对周期性变化的路面温度应力场的影响，并提出了采用多周期迭代计算解决这一问题的有效途径。

A new blunting and cracking model is founded by analyzing the process of specimens blunting and cracking.

经过分析J积分试样的钝化起裂过程，建立了新的钝化起裂模型。

The results show that fractions of the hydrogenation residue are suitable for catalyzed cracking materials instead of cracking materials.

结果表明，加氢尾油的馏分不适宜作为裂解原料，可以作为催化裂化的原料。

In preparation of motor fuel, the bio-oil from pyrolysis of biomass must be further upgraded so as to improve its quality. However the catalyst used in the cracking reaction is easy to lose its activity due to being coked, so that it is important to study the coke formation and its effects on the catalyst activity in the cracking process.

为了获得高质量生物质燃料油，需要对生物质直接裂解得到的生物质油进行催化裂解精制：精制过程中催化剂容易结焦，对精制反应产生很大影响。

The cracking of indentation was a new type of fracture problem. By using the energy release rate of boundary translation the fracture of indentation has been formulized and critical load and critical cracking angle of the indentation have been found.

压痕边界的开裂问题是一个新型的断裂力学问题，通过边界移动的能量释放率的分析给出了压痕边界开裂能量释放率数学表征，并给出边界开裂的临界载荷和临界开裂角。

The water leak failure of 4-way reversing valve for air-condition is caused by the cracking stems inside,the stems cracking is caused by the large amount sulfured manganese inclusions which is distributed axially.

空调四通换向阀是用来切换制冷工质的流经路径，达到制冷和制热转换的目的，具有仅在换向瞬间才通以脉冲电流和自保持的省电功能。2005年初该公司进口一批铁素体不锈钢棒材，材料牌号为X6CrMoS17，即1.4105。

At present, asphalt macadam is often used as bottom course of the overlay on old concrete pavement in order to restrain reflective cracking in the engineering. The results in this research indicated that the abilities of resisting reflective cracking of this mixture were poor. The modified full asphalt mixture is most capable of resisting reflection crack than the others.

目前在工程上为了防治反射裂缝，旧混凝土路面加铺层常采用沥青碎石作底面层，本文的研究结果表明，这种类型混合料抵抗反射裂缝的能力很差，而使用改性沥青的富沥青密实型级配混合料抵抗反射裂缝的能力最强。

In the fourth chapter, study on the structural system and cracking-resistant in bulky concrete of the anchor, combined with the designing and building practice of the anchor in Yichang Yangtse river highway bridge, a optimized gravitational concrete anchor and a systemic measures for the cracking-resistant for the construction of the bulky concrete in the anchor have been developed and adopted in the bridge efficiently which demonstrates the anchor type and the measures are feasible and practical.

在第4章—悬索桥锚碇合理结构型式及综合防裂技术研究中，结合宜昌长江公路大桥设计与施工的具体实践，介绍了宜昌长江公路大桥锚碇结构的合理选取，特别是介绍了宜昌长江公路大桥锚碇大体积混凝土的设计与施工中所采取的综合防裂措施。

Chinese traditional virtue is humility and wariness,the compliment and praise to the others should be declination

中国人的传统美德是谦虚谨慎，对别人的恭维和夸奖应是推辞。如

We bought this house on the never-never.

我们以分期付款的方式买下这座房子。