grit
/grɪt; ɡrɪt/ n[U]
1 tiny hard bits of stone, sand, etc 细石子、 沙粒等
spread grit on icy roads 往结冰的路上撒沙子
I've got some grit/a piece of grit in my shoe. 我的鞋里进了沙子.
2 quality of courage and endurance 勇气和毅力
Mountaineering in a blizzard needs a lot of grit. 在暴风雪中登山需要极大的勇气和毅力. grit, v (-tt-)
1 [Tn] cover (sth) with grit; spread grit on (esp icy roads) 以沙砾覆盖（某物）; 撒沙砾於（尤指结冰的道路）上.
2 (idm 习语) grit one's `teeth
(a) keep one's jaws tight together 咬紧牙关.
(b) (fig 比喻) summon up one's courage and determination 鼓起勇气下定决心
When things get difficult, you just have to grit your teeth and persevere. 遇到困难只需咬紧牙关坚持下去.