先解释带点的词语，再写出诗句的意思。(9分)
（1）好雨知时节，当春乃发生。
知：        
诗句意思：                                                             
                                                                       
（2）随风潜入夜，润物细无声。
潜：        
诗句意思：                                                             
                                                                       
（3）明月别枝惊鹊，清风半夜鸣蝉。
别：            惊：         
诗句意思：                                                             
                                                                       

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