They swallow stones, stones that are used to help grind up the food before it's actually digested in the stomach.

它们吞下石头，在食物在胃里消化之前，这些石头被用来帮助磨碎食物。

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They swallow stones, stones that are used to help grind up the food before it's actually digested in the stomach.

它们吞下石头，在食物在胃里消化之前，这些石头被用来帮助磨碎食物。

youdao