结合本文具体的语言环境来解释下面加粗的词语。  

（1）故虽有名马：                                                                 

（2）一食或尽粟一石：                                                            

（3）食马者不知其能千里而食之：                                                    

　　 食不饱，力不足：                                                        

（4）不以千里称之：                                                                

　　 策之不以其道：                                                          

（5）策之不以其道：                                                                

　　 执策而临之：                                                            

（6）其真无马邪：                                                                  

　　 其真不知马也：