Reentrant feature widely exists in natural structures ranging from mushroom, overhang, undercut, trapezoid, sphere, spatula and taper to sharp edge, and has triggered a biomimetic design revolution of functional surfaces for extreme repellency to fluid foulants, directional fluid navigation, and strong adaptive adhesion. In this Review, we discuss how the bionic introduction of reentrant feature on a surface mediates fluid wetting, contact line motion, as well as solid adhesion. We briefly introduce nature-inspired design principles from representative reentrant surfaces on the springtail, gecko, and pitcher plant. Through quantitatively associating microscopic structural parameters of reentrant feature, including angle, shape, diameter, thickness, sharpness and anisotropy, with macroscopically visible wetting and adhesion properties, we evaluate how the design of reentrant feature can enable exceptional superomniphobicity, strong adaptive adhesion, and directional fluidic navigation, promising an effective guidance for the creation of superomniphobic surface, fluid-navigation surface, adhesive surface or their combinations. The realization of the reentrant surfaces benefits from the rapid development of cutting-edge manufacturing technologies, such as 3D printing, lithography, microfluidics, self-assembly, and template-assisted soft replication. We finally provide potential applications of reentrant surfaces, as well as scientific and technological challenges and opportunities.

可重入特征广泛存在于从蘑菇形、悬垂、底切、梯形、球形、铲形、锥形到尖锐边缘的自然结构中，并引发了功能表面的仿生设计革命，以实现对流体污染物的极度排斥、定向流体导航和强适应性附着力。在这篇综述中，我们讨论了表面重入特征的仿生引入如何调节流体润湿、接触线运动以及固体粘附。我们简要介绍了弹簧尾、壁虎和猪笼草上具有代表性的可重入表面的自然启发设计原则。通过定量关联重入特征的微观结构参数，包括角度、形状、直径、厚度、锐度和各向异性，以及宏观可见的润湿和粘附特性，我们评估了可重入特征的设计如何实现卓越的超疏水性、强适应性粘附和定向流体导航，有望为超疏水表面、流体导航表面、粘附表面或其组合的创建提供有效指导。重入表面的实现得益于3D打印、光刻、微流控、自组装和模板辅助软复制等尖端制造技术的快速发展。我们最终提供了可重入表面的潜在应用，以及科技挑战和机遇。有望为创建超疏水表面、流体导航表面、粘合表面或它们的组合提供有效指导。重入表面的实现得益于3D打印、光刻、微流控、自组装和模板辅助软复制等尖端制造技术的快速发展。我们最终提供了可重入表面的潜在应用，以及科技挑战和机遇。有望为创建超疏水表面、流体导航表面、粘合表面或它们的组合提供有效指导。重入表面的实现得益于3D打印、光刻、微流控、自组装和模板辅助软复制等尖端制造技术的快速发展。我们最终提供了可重入表面的潜在应用，以及科技挑战和机遇。