Balancing scientific exposition and narrative engagement is a central challenge in science communication. To examine how to achieve balance, we conducted a formative study with four science communicators and a literature review of science communication practices, focusing on their workflows and strategies. These insights revealed how creators iteratively shift between exposition and engagement but often lack structured support. Building on this, we developed SpatialBalancing, a co-writing system that connects human spatial reasoning with the linguistic intelligence of large language models. The system visualizes revision trade-offs in a dual-axis space, where users select strategy-based labels to generate, compare, and refine versions during the revision process. This spatial externalization transforms revision into spatial navigation, enabling intentional iterations that balance scientific rigor with narrative appeal. In a within-subjects study (N=16), SpatialBalancing enhanced metacognitive reflection, flexibility, and creative exploration, demonstrating how coupling spatial reasoning with linguistic generation fosters monitoring in iterative science communication writing.

翻译：在科学传播中，平衡科学阐述与叙事吸引力始终是一项核心挑战。为探究如何实现这种平衡，我们首先开展了一项包含四位科学传播者的形成性研究，并结合科学传播实践文献综述，聚焦其工作流程与策略。这些洞见揭示了创作者如何在阐述与吸引力之间迭代切换，但往往缺乏结构性支持。基于此，我们开发了SpatialBalancing协同写作系统——该系统将人类空间推理能力与大语言模型的语言智能相联结。系统在双轴空间中可视化修订权衡，用户可在修订过程中基于策略标签生成、比较并优化文本版本。这种空间外化将修订转化为空间导航，使定向迭代成为可能，从而在科学严谨性与叙事感染力之间取得平衡。在一项受试者内实验（N=16）中，SpatialBalancing增强了元认知反思、灵活性与创造性探索，证明了将空间推理与语言生成相结合如何促进迭代式科学传播写作中的自我监控。