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In order to improve the operation frequency, the self-suck resonator pulse detonation engine was founded, the ignition principle of the new engine use the method of shock focus autooscillation, so, it possess high ignition and operation frequency, many experts have taken experiment and numerical simulation. However, the physical processes in the resonator cavity are very complicate,the reliable theory haven't set up by now, require the further study.

为了提高脉冲爆震发动机的工作频率，自吸气共振型脉冲爆震发动机模型被提出，该新型发动机点火原理采用激波谐振聚焦点火方式，具有很高的点火及工作频率，许多专家对此进行了实验研究和数值模拟，但由于谐振腔内的物理过程非常复杂，到目前为止没有一套可靠的理论，有待于进一步研究。

Require price for 2 and 4 cavity tool.

需要你们2和4型腔工具的报价。

However if there are signs of systemic illness or extensive cellulitis, treatment may require intravenous antibiotics.

但是，如果有迹象表明，系统性疾病或广泛的蜂窝组织炎，治疗可能需要静脉注射抗生素治疗。

Some forms of severe cellulitis may require surgery and leave a person with scarring.

某种形式的严重的蜂窝组织炎，可能需要外科手术和离开一个人与疤痕。

To find the exact point where the centerline is will require some measuring and thread placement adjustment.

准确地找到所需的点，中线是将需要一些测量及线位置的调整。

Then, in October 2004, the diamond below the line experiences central emerge as the times require.

于是，2004年10月，线下的钻石体验中心应运而生。

CERES may require residue analyses for spray mixtures from time to time.

CERES可能要求对喷出的混合物的残渣进行分析。。

Cerium oxide has a wide range of uses, but many applications require special physics properties of particles. It is particle morphology, size, structure, dispersion, surface properties ,this physical and chemical properties, that determine their application field, but the traditional preparation process is difficult to control cerium oxide particle morphology and physical properties, thus making it difficult to meet the application requirements.

氧化铈有着广泛的用途，但很多方面的应用都要求其粒子具有特殊的物性，粒子的形貌、尺寸、结构、分散性、表面性能等物化性能决定其应用领域，但传统制备工艺难以控制氧化铈粒子的形貌及物性，从而难以满足应用的需求。

As for the payment, we usually require certified check, that is L/C.

关于支付条件，我们通常要求保对的、即期信用证

Swiftness and certitude require strength, and the man had not this strength.

敏捷和准确是要以力气为凭借的，而他现在没有这种力气。

The French are not suggesting a new EU treaty, but they have plenty of other wheezes.

法国人并不是在建议签署一个新的欧盟条约，但他们有许多其他的阴谋。

This letter was written by my brother.

这封信是我弟弟写的。