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Many remarkable properties of graphene are derived from its large energy window for Dirac-like electronic states and have been explored for applications in electronics and photonics.The interplay of graphene's unique electronic structures and lattice vibrations under photo-excitation(strong electron-phonon interaction)has led to efficient photo-thermo energy conversions,which has been harnessed for energy applications.Here we introduce another innovative application: coherent generation of acoustic waves in a multi-layer graphene(MLG)sheet at ambient environment.