Multiply imaged time-variable sources can be used to measure absolute distances as a function of redshifts and thus determine cosmological parameters, chiefly the Hubble Constant H\(_0\). In the two decades up to 2020, through a number of observational and conceptual breakthroughs, this so-called time-delay cosmography has reached a precision sufficient to be an important independent voice in the current “Hubble tension” debate between early- and late-universe determinations of H\(_0\). The 2020s promise to deliver major advances in time-delay cosmography, owing to the large number of lenses to be discovered by new and upcoming surveys and the vastly improved capabilities for follow-up and analysis. In this review, after a brief summary of the foundations of the method and recent advances, we outline the opportunities for the decade and the challenges that will need to be overcome in order to meet the goal of the determination of H\(_0\) from time-delay cosmography with 1% precision and accuracy.

多重成像时变源可用于测量作为红移函数的绝对距离，从而确定宇宙学参数，主要是哈勃常数 H \(_0\)。到2020年为止的二十年里，通过多项观测和概念上的突破，这种所谓的时滞宇宙学已经达到了足够的精度，足以成为当前早期和晚期的“哈勃张力”争论中的一个重要的独立声音。 H \(_0\)的宇宙决定。由于新的和即将进行的调查将发现大量透镜，并且后续和分析能力将大大提高，2020 年代有望在时滞宇宙学方面取得重大进展。在这篇综述中，在简要总结了该方法的基础和最新进展之后，我们概述了十年来的机遇以及为实现确定 H \(_0\)的目标而需要克服的挑战来自具有 1% 精度和准确度的时滞宇宙学。