He is grinding flour.

他正在磨面粉。

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Windmills Another former staple9) of Dutch agricultural life, mills were originally used for all sorts of practical purposes such as grinding flour, sawing wood, or pumping water.

荷兰农业社会遗留下来的另一特色物品是风车。 风车最早是用于各种实用目的，如磨制面粉、锯木材或者抽水。

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They are grinding wheat into flour.

他们正在把小麦磨成面粉。

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The windmill was a Medieval European innovation and both wind and water mills were not just used for grinding flour but also fuilling cloth, making leather and driving bellows and trip-hammers.

FORBES: What Are Examples of Things in the "Common Knowledge" about History That Historians Almost Universally Consider Incorrect?