我们在公园里安装了一个蹦床，孩子们玩得很开心。

We set up a ___trampoline in the park, and the kids had so much fun.

孩子们在蹦床上玩得很开心，不停地跳来跳去。

The kids were having fun ___trampolining up and down on the trampoline.

体操运动员在蹦床上完成了三周空翻的高难度动作。

The gymnast performed a triple flip on the ___trampoline during the competition.