blithely

例句：

1. 1. She blithely walked into the room, completely unaware of her surroundings.
   她愉快地走进房间，完全不知道自己所处的环境。
2. 2. He blithely accepted the challenge and set out to solve the problem.
   他愉快地接受了挑战，并开始解决问题。
3. 3. The couple blithely enjoyed their honeymoon in the warm sunshine.
   这对夫妇愉快地在温暖的阳光下享受蜜月旅行。