▎ 摘　　要

We investigate the translational and rotational motions of a nanoscale graphene flake with the retracting-motions by performing classical molecular dynamics simulations. While the translational motions of the graphene flake are quickly damped, the rotational motions of the graphene flake remain for a long time and its full rotations are found. This rapid damping of its translational motions shows that graphene-flake oscillators have a weakness to be stable translational-motion oscillators because of very low quality-factors in the translational motions. Graphene flakes have a great potential to be a core component in NEMSs by detecting their motions with ultrahigh sensitivity to facilitate the development of sensor, memory, and quantum computing.