grit [grɪt]

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n.沙粒，决心，勇气；vt.下定决心，咬紧牙关；研磨；vi. 摩擦作声

very small pieces of stone or sand

The soldiers showed that they had plenty of grit. 士兵们表现得很有勇气。
I've got some grit in my shoe. 我的鞋子里弄进了一些砂子。