研杵

例句：

1. 1. The ancient scholars used to use a wooden rod as their main tool for grinding grains.
   古代学者过去常用一根木棍作为他们磨谷物的主要工具。
2. 2. In the kitchen, there is usually an iron pot with a wooden handle on it, which can be used as a mortar and pestle for grinding spices.
   厨房里通常有一个带木柄的铁锅，可以用来研磨香料。
3. 3. The scientist uses a special metal rod called a 'hammer' to crush and grind samples for analysis.
   这位科学家使用一种叫做‘锤子’的特殊金属杆来粉碎和研磨样本以供分析。