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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We grind up the wheat to make flour.

我们把小麦磨成面粉。

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We grind up the wheat to make flour.

他们正在把小麦磨成面粉。

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A mineralogist at the California Institute of Technology, Rossman says serpentine is only dangerous if you grind it up and inhale the particles.

VOA: standard.2010.07.26

When I get out of the bike's saddle to grind up Page Mill Road behind Palo Alto, Calif.

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When I get out of the bike's saddle to grind up hills, I actually have to click to a higher gear.

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The pumps, however, both grind up the fish and disrupt the tidal flows, thus threatening to kill native species and inviting invasive ones.

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