这是一个充满欢笑的节日。
It's a ___joyful festival.
孩子们在公园玩耍时充满了欢乐。
The children were ___joyful while playing in the park.
孩子们听到放假的消息时，脸上露出了欢快的笑容。
The children's faces lit up with ___joyful smiles when they heard the news about the holiday.
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