pestle

n.

（捣碎或碾磨用的）杵；

复数：pestles

1. He ground the rock candy with a mortar and pestle.
   他自己动手用研钵和杵把冰糖研成粉。
2. A pestle can be ground into a needle and true knowledge comes from perseverance.
   想得到真正的学问，必有须磨杵成针的精神。

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