gradation
noun [ C or U ] uk/ɡrəˈdeɪ.ʃən/ us/ɡreɪˈdeɪ.ʃən/
(CHANGE)
逐渐的变化；（变化过程的）阶段，层次
a gradual change, or a stage in the process of change
The gradation in/of tempo in this piece of music is very subtle. 这支曲子节奏的变化非常微妙。
(MARK)
刻度，量度
(one of) a set of marks showing units of measurement on a jug, tube, or instrument
the gradations on a ruler 尺子的刻度