应填 satisfying，a satisfying experience 指令人感到满意的经历。

Taking part in the celebration was a satisfying experience for us. (satisfied, satisfying )

参考译文：参加这次庆祝活动对我们来说是一次令人满意的经历。

【1】satisfying  令人高兴的;令人有满足感的【使别人感到满意的人或者事物】

I found wood carving satisfying.  我觉得木雕能给人带来满足感。

This is a satisfying meal.这是一顿可口的饭菜

It is a satisfying experience它是一次令人满意的经历

It's satisfying to play a game really well.一种游戏玩得特别好是一桩惬意的事。

【2】satisfied  adj.  满意的; 欣慰的; 信服的;【自己感到满意的人或者表情】

She gave me a satisfied smile她给了我一个满意的微笑

He is a satisfied customer他是个满意的顾客

We are not satisfied with these results.  我们对这些结果并不满意