縮句。   
1．輕快靈活的小艇穿過一座座形式不同的石橋。   
                                                                                                                     
2．許多孩子高高興興地到郊外去呼吸新鮮空氣。  
                                                                                                                     
3．簇擁在一起的小艇一會兒就散開了。