The children tumbled about in the sand pit.

小孩在沙坑里翻滚着玩.

《现代汉英综合大词典》

Go down the sand pit and dig for the bones of stegosaurus!

快到大沙坑里挖掘剑龙的骨头吧.

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The children were playing in the sand pit.

孩子们在沙坑中玩耍.

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The childern had a whale of a time playing in the sand pit.

孩子们在沙坑里玩得非常高兴.

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