在英语中，形容一个人脸上都是沙子的表达可以是 "He is covered in sand." 或 "His face is covered in sand."。
这个表达的来源可能是由于沙子很容易落在人的脸上，因此被用来形容一个人脸上有很多沙子。
下面是一些英文例句和中文翻译：
After playing on the beach all day, the children's faces were covered in sand. (在海滩玩了一整天后，孩子们的脸上都是沙子。)
The wind had blown sand all over her face and hair. (风吹得她的脸和头发上都是沙子。)
He had to wipe the sand off his face before he could see clearly. (他必须把脸上的沙子擦掉才能看清。)