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Furthermore, the electronic tattoos possessing excellent conformity with the skin were directly printed in situ on the wrist and can be employed to monitor the motion of the wrist along two different bending directions.Thermal rectification is a direction-dependent asymmetric heat transport phenomenon. Here we report the tunable solid-state thermal rectification by asymmetric nonlinear far-field radiation. The asymmetry in thermal conductivity and emissivity of a three-terminal device is realized by sputtering a thin metal film (radia