gradation

US /ɡreɪˈdeɪ.ʃən/
UK /ɡreɪˈdeɪ.ʃən/
"gradation" picture
1.

渐变, 等级, 层次

a scale or a series of successive changes, stages, or degrees

:
The colors of the sunset showed a beautiful gradation from orange to purple.
日落的颜色呈现出从橙色到紫色的美丽渐变
The teacher explained the concept with a clear gradation of difficulty.
老师用清晰的难度分级解释了这个概念。
2.

分级, 渐变

the process of arranging in a series of stages or degrees

:
The artist achieved a smooth gradation of tones in the painting.
艺术家在画作中实现了平滑的色调渐变
The training program involves a careful gradation of skills.
培训计划涉及技能的仔细分级