名詞 grindstone:

1. a revolving stone shaped like a disk; used to grind or sharpen or polish edge tools

1. The teacher believed in hard work and always keep our nose to the grindstone.
   老師提倡勤奮，而且也總是要我們埋頭讀書(shū)。
2. I always admire men, even the dullest, who know their job and put their noses to the grindstone.
   我一向敬重那些有專長(zhǎng)且做事勤奮不懈的人，包括那些最沒(méi)情趣的人。
3. Our factory produces grindstone.
   我們工廠生產(chǎn)磨刀石。
4. They ground the knife on a grindstone.
   他們?cè)谀サ妒夏サ蹲印?/div>

grind.stone

n.（名詞）
A revolving stone disk used for grinding, polishing, or sharpening tools.
砂輪：用來(lái)打磨、打光或磨利工具的旋轉(zhuǎn)石盤(pán)
A millstone.
磨石

<習(xí)慣用語(yǔ)>put (one`s) nose to the grindstone【非正式用語(yǔ)】
To work in earnest.
認(rèn)真地工作