Knowledge saves anyone  from falling                                                                                       From top to bottom                                                                                                 Simply because it lets anyone knows exactly                                                        What's going on around ...                                                                                      If you know a little bit ,then                                                                                    You can walk greatly ,but                                                                                       If you don't know anything ,then                                                                                             It's all a dead-end ...                                                                                                     To know is better than not to know ....