小狗们在草地上欢快地嬉戏，滚来滚去追着自己的尾巴玩。

The puppies ___frolicked happily on the grass, rolling around and chasing their tails.

孩子们在公园里嬉戏玩耍，追逐着蝴蝶。

The children were ___frolicking in the park, chasing butterflies.