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CCombining knowledge of chemistry,physics,biology,and engineering,scientists from McGillUniversity develop a biomaterial tough enough to repair the heart,muscles,and vocal cords,drepresenting a major advance in medicine."People recovering from heart damage often face a long and tricky journey.Healing ischallenging because of the constant movement tissues must withstand (as the heart beats.Thesame is true for vocal cords.Until now there was no injectable(可注射的)material strong enoughfor the job,"says Guangyu Bao,a PhD candidate in the Department of Mechanical Engineering atMeGill University.The team.led by Professor Luc Mongeau and Assistant Professor Jianyu Li,developed anewinieetable hydrogel ()for wound repair which is a type of biomaterial that provides roomforcells to live and grow.Once injected into the body,the biomaterial forms a stable structure allowinglive cells to grow or pass through to repair the injured organs.YThe results are promising,and we hope that one day the new hydrogel will be used to restorethe voice of people with damaged vocal cords,"says Guangyu Bao.The scientists tested the durability of their hydrogel in a machine they developed to copy theextreme biomechanics of human vocal cords.Vibrating (at 120 times a second for over 6million cycles,the new biomaterial remained undamaged while other standard hydrogels broken intopieces,unable to deal with the stress of the load."We were incredibly excited to see it worked perfectly in our test.Before our work,no injectablehydrogels possessed both high porosity and toughness at the same time.To solve this issue,weintroduced a pore-forming polymer to our formula(配方)，”says Guangyu Bao..The innovation opens new ways of making progress for other applications like tissue engineeringThe team is also looking to use the hydrogel technology to create lungs to test COVID-19 drugs.8.Why did the researchers develop the new biomateria?A.To experience a journey.B.To repair wound.C.To represent an advance.D.To replace organs.29.What is unique of the biomaterial compared to other materials?A It is heavier./B.It is more breakable.C.It is changeable..It ismore injectable.30.What might the researchers do next about the biomaterial?公、A.Make artificial organs for drug test.B.Try hard to increase its toughness.C.Apply it to the cure of COVID-19.D.Adjust their formula to improve it.31.What the author's pupose of writing this passag?A.To show his respect to the researchers.B.To stress the importance of innovation.C.To promote the sales of a new hydrogel.D.To introduce a newly-developed material.