2.                     
                            
                
                    
                
                    
        OCW makes the materials used in the teaching of MIT's subjects available on the Web.
         
         
         
        Learn more about how to use OpenCourseWare. Click to get started.
                            
               
           
           
                        
           
            1. 
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http://b45793.nhde20.cn/7c7fe5.html |

 年龄越小下面越紧吗