她有一个无忧无虑的童年，充满了欢笑和冒险。

She had a ___carefree childhood, filled with laughter and adventure.

他时常回想起成年之前那段无忧无虑的青春岁月。

He often thinks back to his ___carefree youth before the responsibilities of adulthood.

度假时，我们享受着一种无忧无虑的生活方式，远离了所有平常的烦恼。

On vacation, we enjoy a ___carefree lifestyle, away from all our usual worries.