I had to find a way to grind the corn into flour, but the rocks on the island were not hard enough.

我必须想办法把玉米磨成面粉，但岛上的岩石不够坚硬。

youdao

In the center of the house, the tools which could grind wheat into flour were covered with thick dust and the trace of mice, a rude donkey saddle and some stained sacks lying nearby it.

在房子的中央，磨面粉的磨被厚厚的灰尘覆盖，还有一些老鼠的足迹，一个粗糙的驴子的马鞍和一个斑斑点点的麻布袋在附近。

youdao

Mills used to use heavy stones to grind down the wheat into flour; now they use more modern machinery.

磨房过去使用笨重的石磨把麦磨成面粉；现在它们使用的是比较现代的机械。

youdao

There's a way to actually grind down and prepare the flour, so that you promote the enzymes within the plant to breakdown the cyanide precursors.

有一种方法是将它们磨碎，做成粉，这样就可以促进它们本身带有,酶将氰化物的前驱体分解掉。

麻省理工公开课 - 化学原理课程节选

Oh, sure, ADM operates factories that crush oil out of soybeans and sunflowers, grind wheat into flour and turn cocoa beans into powder.

FORBES: ADM Should Pop Again If Lawmakers Renew Ethanol Producer Tax Credits

Cornmeal can range from a fine flour to a grind as coarse as Kosher salt.

NPR: Kernels of Truth About Cornmeal