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Therefore, an artificial working memory is highly anticipated to endow computing systems with advanced capabilities. Herein, an artificial working memory that can synthesize and process multimodal information to enable a brain\u2010inspired hierarchical memory system is developed. To emulate the characteristic synaptic behavior of working memory, a planar 2D channel memristor (PTCM) with stable short\u2010term frequency\u2010dependent plasticity is designed. An array of PTCMs on a monolayer MoS<jats:sub>2<\/jats:sub> grain are assembled and the information encoding, forgetting, retrieval, and updating functions of working memory are experimentally demonstrated. A hierarchical memory system through simulation, which integrates working memory network, sensory memory, and long\u2010term memory, is built, emulating the information synthesizing and processing procedures of the human brain. 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