Because nonferrous metals are hard to grind, this rolling tool is extremely significant for nonferrous metal machining.

由于有色金属磨削困难，因此这种滚压工具对有色金属的加工更具有特殊意义。

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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。

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But it's hard to keep your vision alive when you actually get into the day-to-day grind.

但是当你真正陷入日复一日单调乏味的生活中的时候，能始终坚持你的梦想是很困难的。

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The extreme heat and pressures had caused the barite to form a cement like material that was hard to grind away.

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