What happens when Clunk fills four weather balloons with gas? It's fun in the clouds - but how can Clunk come down again? How can Ben, Rosie, and Grandpa help him?
當Clunk把四個探空氣球灌滿空氣時，會發生甚麼事呢？飛在天上的氣球實在有趣，不過Clunk要怎麼辦才能從天上下來呢？Ben、Rosie及爺爺要怎麼幫助他下來呢？
當Clunk把四個探空氣球灌滿空氣時，會發生甚麼事呢？飛在天上的氣球實在有趣，不過Clunk要怎麼辦才能從天上下來呢？Ben、Rosie及爺爺要怎麼幫助他下來呢？