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physical forces of landing,perching and takeoff."What surprised us was that they did the same aerial military exercise,no matter what surfacesthey were landing on,"one of the researchers,William Roderick,explained in the news release."They let the feet handle the variability and complexity of the surface texture itself,"he said.Giving a drone similar abilities required technological feat ()SNAG has a 3D-printedstructure that imitates an eagle's lightweight bones,and each of its legs is equipped with a motorfor moving back and forth and a second one for grasping.Mechanisms in the robot's legs are designed to absorb impact energy and passively change itinto grasping force,the way that a bird's muscles would.As a result,a drone equipped with thedevice can grasp something strongly in just 20 milliseconds.Once the robot's feet are wrappedaround a perch,its ankles lock and an accelerometer-a device that measures vibration-detects thelanding and activates a balancing algorithm ()to stabilize it on the perch.Elsewhere,researchers at other institutions also have been working for years on giving dronesthe ability to land and hang onto something.As this 2019 Smithsonian article explains,being ableto land in various places helps drones to conserve energy that would expend by having to remainin the air.That's important,because the flight time of robotic aircrafts is limited by their batterypower.8.What inspired the SNAG's development?A.The way parrots perch.B.The military exercise.C.The 3D-printed technologyD.The eagle's lightweight bones.9.What makes the drones'grabbing something strongly so quickly possible?A.The powerful battery.B.Their ability to imitate parrots'taking off.C.The application of advanced flying techniques.D.The mechanical devices modeling a bird's muscles.10.What can we infer from the last paragraph?A.Flight time is not vital to the drones.B.After 2019,researchers quit efforts to improve flight time.C.Flight time has been a problem before this studyD.Researching the ability to land and hang onto something is meaningless.高三英语第4页（共10页）