无忧虑的

例句：

1. 1. She was happy to have a day off from work.
   她很高兴从工作中解放出来休息一天。
2. 2. He felt carefree as he explored the new city.
   他感到无忧无虑，因为他探索了这个新城市。
3. 3. The carefree days of childhood are long gone.
   无忧无虑的童年时光已经一去不复返了。