(1)sand 一般指海边河边的那种粉末状细沙，河沙，复数表示沙滩

Ouch! The sand is so hot! I can burn my feet.

哎哟！沙子这么烫！会烫伤脚的。

A grain of sand made my right eye tear.

一粒沙子弄得我右眼淌泪。

The children on the sand were shouting with excitement.

沙滩上的孩子们兴奋得大喊大叫。

The violent winds buried the village in sand.  

狂风把村子掩埋在沙中。

The box was full of sand.  

箱子里满是沙土。

Where can I lay this load of sand?  

这堆沙子我该放在哪儿?

He mingled soil and sand.  

他把泥土和

(2)grit 一般指那种用来铺路的防滑的比较坚硬的小砂子，小砂石，引申为“勇气，毅力，坚毅，果敢”

 He felt tiny bits of grit and sand peppering his knees.  

他感到细小的沙砾不断打在膝盖上。

Grit is spread on roads to make them less slippery in icy weather.

在结冰的天气，在路上撒上砂砾心免路面太滑。

Because all the gears are enclosed within the hub, road grit can't get inside to abrade the metal parts.

因为所有的齿轮都套在轮毂内，路面上的砂石不会跑进齿轮之间磨损金属部件。

The soldiers showed that they had plenty of grit.

士兵们表现得很有勇气。

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。

You've got to admire her grit.  

你不得不佩服她的勇气。