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he olowngouhmRU?Tehyno devices thanslingnewhodhouldermore rptyor reeyeling practisedevicesy to take aprtitwillgndTheie the produch the price teh companies pyohmost probablym rom?A.A literary work.且A social study.C.A scientific article,D.A news report.DD prining scenists have successfuly conrutedhuman-like ars on the backsThereisa chance that this technique could be applied to grow new ears or otherod parsin the human body,so that surgery is not required.ginmoretosee customized ribs,spinal vertebrae,and other new bodybu by 3D printing.However,patients are facing the risk of infeetion,for these partsbe D printed outside the body before they are implanted through surgery.Cure Gou Maling from Sichuan University and his coleagues have proved thatbody parts can be 3D printed inside the body,at least in mice,without the need for surgery.Initially.the researchers injected bio-inks made from hydrogel particles(水凝胶微粒）and cartilage()cells into the mice's backs.Then,the bio-inks were exposed to the ear-ped pattem of near-infrared(近红s外的)light..This crucial step allowed the hydrogelpartides to stick together and grow layer-by-layer.until they formed ear-shaped structures.During the following month,the cartilage cells grew around the hydrogel structures,finallying structures similar to the cartilage structures of actual human ears.Throughout theprocess.the mice experienced no side effects.The famous Vacanti mouse in the 1990s also had a human like ear grown on its back,but it was made by implanting a pre-made plastic structure seeded with cartilage cellsudereath the skin,rather than 3D printing the structure directly at the site.The researchers expect this new technique could be used to construct new ears for peoplebom with microtia,a condition that prevents ears from growing properly."We are makingfostoimprove this technique for treating human ear defects in the future,"said Gou.According to Derek Rosenzweig at McGill University in Canada,the non-surgical 3Dpmingtechnique could also be potentially helpful in fixing damaged cartilage in noses,rreows While Gou's team looks forward to adapting this techniquetodamaged organs such as the heart or lungs,Rosenzweig expressed his concern.ore hallengn becaus the heart n lungcn mutiple cell types,areondrconracting and relangd ose2.uthe new3Dtechnique?wurical methods.expecesie effects.Ccusoibodyrs.body parts to grow in the body.