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Over the past decade, gallium-based liquid metals have attracted enormous attention, emerging as a new cutting-edge multi-functional material for reconfigurable electronics, soft robotics, microfluidics, and biomedical applications, based on utilizing the intrinsic advantages of liquid metal. These unique advantages that combine high electrical conductivity, thermal conductivity, biocompatibility, low mechanical compliance, and viscosity all-in-one make the liquid metal applicable for a tremendous number of applications. Moreover, the self-passivating oxide skin of the liquid metal in an ambient environment forms a unique core (oxide skin)-shell (liquid metal) structure and provides a new strategy for two-dimensional thin films with a thickness of a few nanometers. The reports on the liquid metal can be mainly divided into three categories: 1) liquid-metal-based composite structures; 2) the core-shell strategy for thin films; and 3) electrochemical manipulation of the liquid metal in e