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Based on wave propagation feature, this paper analyses 3D seismic migration algorithms such as alternating direction implicit method, LU decomposition method, and inverse operator approach method. The result shows that the alternating direction implicit method is fast but causes distortion in wave field extrapolation and affects image accuracy; however LU decomposition and inverse operator approach methods are fast while holding circular symmetry of wave field, and are promising in oilfield exploration and development.

在波的传播特征分析基础上，对交替方向隐式法、LU分解法、逆算子逼近法等三维地震偏移算法进行了分析研究，结果表明，交替方向隐式法虽然快捷但是在波场外推中明显产生畸变并影响成像的准确性，而LU分解和逆算子逼近法是保持波场圆对称特征前提下的快速算法，在油田勘探开发中具有较好的应用前景。

This not only aids in holding down the magnets, but it will protect the alternator from moisture.

这不仅艾滋病按住磁体，但它可以保护发电机防潮。

A man named Amadou Bailo shuffled toward us, holding one end of a stick as his daughter held the other and walked ahead of him.

一个名叫Amadou Bailo的男人缓缓向我们走来，女儿牵着棍子的一头走在前面，他牵着另一头跟在后面。

The deal should leave Anglo in full control of the Minas-Rio iron ore project, and holding 70 per cent of the Amapa project in Brazil.

此笔交易应能使英美资源集团完全控制Minas-Rio铁矿石项目，并持有巴西Amapa项目70%的股权。

Example 2: Acknowledging this display of popular will as a signal that Italians feel their political system no longer works, prime minister Giuliano Amato resigned after ten months of holding together a much reviled coalition Cabinet.

意大利首相承认这种普遍意愿的表露意味着意大利人民觉得他们的政治体系已经不起作用了，于是他在领导了十个月备受指责的联合国会之后，提出辞呈。

Recently, of a new alliance holding water is to make more Microsoft and Linux are in the combat of car domain is Anacreontic changed.

近日，一个新联盟的成立更是使得微软与Linux在汽车领域的争斗明朗化了。

Master analytical method and technology on system management, holding the basic ability of modern information system design.

掌握系统管理的分析方法和技术，具有现代信息系统设计的基本能力。

With only 9,000 of the 70,000 population holding an Andorran passport, and the footballers among these numbering in the hundreds.

安道尔7万人口中只有9000人拥有该国护照，其中能踢球的大概只有几百。

In the foreground Andreas is holding one of the compressor wheels he used for strength analysis.

在前台Andreas是持有他的实力分析中使用的压缩机车轮之一。

She said holding Angie's hand.

她说，持有视角的手。

You can do some assertiveness training.

你可以进行一些自信训练。

We were well on the path to making a rear-wheel-drive global platform," says Mays."

我们正致力于建立一个后轮驱动的平台，"Mays这样说道。"