解释下列词语。  

①亘古：                                   

②喜出望外：                               

③蹒跚：                                   

④呕心沥血：                               

⑤凌厉：                                   

⑥翩跹：                                   

⑦粗犷：                                   

⑧暴虐：                                   

⑨真谛：                            _