病毒一直是人类生存和发展的重大威胁，近年来新冠肺炎疫情更是直观地凸显了病毒的危害性。小分子药物在人类抗击疾病的历史中扮演着重要的角色。在对抗病毒的过程中，人类发展出一系列防治手段，其中小分子抗病毒药物占据着重要地位。本文借鉴中国古代经典军事策略“三十六计”的智慧，简要回顾了小分子抗病毒药物的发展历程，并着重介绍了碘苷、沙奎那韦、奥司他韦等代表性药物的设计思路与作用原理。此外，本文还展望了小分子抗病毒药物及抗病毒手段未来的发展方向。

A simple two-step hydrothermal method synthesized four different CdS/Fe₃O₄ photocatalysts with varying ratios of mass of CdS to Fe₃O₄. The composition and morphology of the prepared samples were investigated using X-ray diffraction (XRD), Raman spectrum, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Solid UV reflectance spectra testing found that CdS/Fe₃O₄ nanocomposites had good light absorption throughout the spectral range, promoting their photocatalytic properties. Under visible light irradiation, CdS/Fe₃O₄ (2:5) with a mass ratio of 2:5 exhibited excellent photocatalytic performance, with a degradation rate of 98.8% for rhodamine B. Furthermore, after five cycles of photocatalytic degradation reaction, the rhodamine B degradation rate remained at 96.2%, indicating that the photocatalysts have good photocatalytic stability.