她在洗碗时哼着一首欢快的小曲。
She hummed a cheerful ___ditty while washing the dishes.
奶奶哼着欢快的小曲儿在厨房里忙碌。
Grandma hums cheerful ___ditties while working in the kitchen.
孩子们唱着欢快的小调在操场上玩耍。
The children sang a happy ___ditty while playing in the playground.
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