标题： 引力透镜效应 显示英文标题

标题： Gravitational lensing

摘要： 这是一篇关于引力透镜的简短且有偏见的综述，重点放在射电和特别是甚长基线干涉测量（VLBI）方面。 我们简要解释了基本思想，并概述了第一个透镜的发现，然后更系统地讨论了可以利用透镜研究的一般领域。 我们故意省略了普通透镜专家可能希望看到的细节，而是尝试提供一个非常一般的概述，面向从事其他领域的射电天文学家。 作为例子，我们介绍了透镜 B0218+357，以展示许多透镜方面的特性，在这个已经产生了有趣结果的情况下，它在未来仍然具有潜力。 显示英文摘要

摘要： This is a short and biased review of gravitational lensing with emphasis on the radio and especially VLBI aspects. We briefly explain the basic idea and give a short sketch of the discovery of the first lens, before we more systematically discuss the general fields that can be studied with lensing. We intentionally omit the details the average lensing expert would like to see and instead try to give a very general overview addressed to the radio astronomer working in some other field. The lens B0218+357 is presented as an example to show many aspects of lensing in a case that already has led to interesting results but still has additional potential for the future.