A large portion of texts is written in English, but readers who see English as a Foreign Language (EFL) often struggle to read texts accurately and swiftly. EFL readers seek help from professional teachers and mentors, which is limited and costly. In this paper, we explore how an intelligent reading tool can assist EFL readers. We conducted a case study with EFL readers in South Korea. We at first developed an LLM-based reading tool based on prior literature. We then revised the tool based on the feedback from a study with 15 South Korean EFL readers. The final tool, named Reading.help, helps EFL readers comprehend complex sentences and paragraphs with on-demand and proactive explanations. We finally evaluated the tool with 5 EFL readers and 2 EFL education professionals. Our findings suggest Reading.help could potentially help EFL readers self-learn English when they do not have access to external support.

翻译：大量文本以英语撰写，但将英语视为外语（EFL）的读者常常难以准确且快速地阅读文本。EFL读者向专业教师和导师寻求帮助，但这种资源有限且成本高昂。本文探讨了一种智能阅读工具如何辅助EFL读者。我们以韩国的EFL读者为对象进行了案例研究。首先，我们基于先前文献开发了一款基于LLM的阅读工具。随后，根据15名韩国EFL读者的研究反馈，我们对该工具进行了改进。最终工具命名为Reading.help，它通过按需与主动解释，帮助EFL读者理解复杂的句子和段落。最后，我们通过5名EFL读者和2名EFL教育专业人士对该工具进行了评估。我们的研究结果表明，当EFL读者无法获得外部支持时，Reading.help可能有助于他们自主学习英语。