B

　　Even though it doesn’t have a head,you can still tell what kind of animal it is:the robot is definitely modeled upon a cat.Developed by EPFL’s Biorobotics Laboratory(Biorob),the “cheetah-cub robot,” a small-size quadruped prototype robot,is described in an article appearing today in the International Journal of Robotics Research.What is special is the design of its legs,which makes it very fast and stable.

　　This robot is the fastest in its kind.During tests,it showed its ability to run nearly seven times its body length in one second.In addition,the robot is extremely light and can be easily made from materials that are inexpensive and readily available.

　　The machine’s strengths all lie in the design of its legs.The researchers developed a new model with this robot,one that is based on the careful observation and faithful reproduction of the cat-like leg.The number of segments(分段)—three on each leg—and their proportions(比例)are the same as they are on a cat.Springs are used to reproduce tendons(肌腱),and actuators—small motors that turn energy into movement—are used to replace the muscles.

　　Biorob director Auke Ijspeert said,“It’s still in the experimental stages,but the long-term goal of the cheetah-cub robot is to be able to develop fast,agile,grounded machines for use in exploration,for example for search and rescue in natural disaster situations.Studying and using the principles of the animal kingdom to develop new solutions for use in robots is the nature of our research.”

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