孩子们在草地上快乐地翻跟头。
The children happily ___tumble on the grass.
孩子们欢笑着滚下草坡。
The children laugh as they ___tumble down the grassy hill.
孩子们在体操课上学习如何翻滚。
The children learned how to ___tumble in their gymnastics class.
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