tone of gray

• 灰色色调,半色调等级,黑白亮度等级

tone of gray的用法和样例：

例句

1. Snow and ice are white, but debris or rough surface can change it into a grey tone.
   雪和冰均呈白色，但是碎石或凸凹不平的地表可使其变成灰色色调。