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flexibilityclose to that of human hands.Soft robots currenty made with rubberarealready beingused in manufacturing,where a hand-like device is programmed to grab an item from aconveyerbelt-picture a hot dog or piece of soapand place it in a container to be packaged.But the nes in usenow eanon hydraulics(液压装置)to change the shape of the“hand”topick up the item.This is not desired because it is difficult to imprint a network of tubes nto theserobots to deliver liquid into them.Imagine how many different things you can do with your handand how fast you can do them owing to your neural()network.Because the rubber andhydraulics are not as multifunctional as your biological tissues,which is a hydrogel,state-of-the-art soft robots can only do a limited number of movements.Katke explained that the process they have researched allows the hydrogels to change shape,then change back to their original form"significantly faster this way"in soft robots that are largerthan ever before.At present,only microscopic-sized hydrogel robots can respond to a chemicalsignal quickly enough to be useful and larger ones require hours to change shape.By using the new method,soft robots as large as a centimeter may be able to transform injust a few seconds,which is subject to further studies.Larger flexible soft robots that could respondquickly could improve assistive devices in healthcare,"pick-and-place"functionsmanufacturing,search and rescue operations and contact lenses.in1.Whatis he poteialadvantage fbe osA.They are cheaper to produce.B.They can be set to take a grab.C.They can be used for drug delivery.D.They generate faster and easier changes.13.Why are hydraulic systems not favored in current soft robots?A.They are not programmable.B.They function in a limited way.C.They require a constant supply of liquid.D.They are unportable for weight.(14.What breakthrough has been made in paragraph4?A.Reducing the size of the robots.B.Making the robots self-sufficient in energy.C.Enabling larger hydrogel robots to change shape faster.D.Improving the hydraulic system's efficiency.Whi of he lehe heo?A.Promising.B.Challenging.C.Demanding.D.Uncertain英语试