解释下列词语。

①确凿：                                                      _ 

②轻捷：                                                        

③陌生：                                                        

④质朴：                                                        

⑤鉴赏：                                                        

⑥渊博：                                                        

⑦人迹罕至：                                                

⑧人声鼎沸：