The discovery of carbon nanostructures(fullerenes,nanotubes,graphene)has opened a revolutionary research area centered on nanoscience and nanotechnology during the past a few decades[1].Among those structures,a single-walled carbon nanotube(CNT)has a diameter of about 1 nm and length up to centimeters,forming a one-dimensional(1D)single crystal which is“straight and narrow”[2].Numerous potential applications including strong fibers and composites,flexible electronics,renewable energy uti-lization and environmental clean-up,have been explored.One of the most intriguing properties of CNTs,is that they possess both high mechanical strength and structural flexibility;these two properties generally cannot be obtained simultaneously in most conventional materials.Imagine that if such a nanotube can be grabbed like a rope hold by two children,it can swing,oscillate,and even dance.Researchers have constructed“the smallest nan-otube violin”by stimulating a suspended CNT to vibrate at tunable resonant modes,just like the strings of a violin[3].However,this violin must work under excitation by an electric field and the nan-otubes are so short that it is very challenging to fabricate and char-acterize such small devices.Thus,the great beauty and potential of“nanotube strings”that attract many researchers,remain elusive and have not been thoroughly investigated.