1
be monotonic
This function is monotonic.
该函数是单调的。
单调的
先理解核心含义，再看它在真实句子里的用法。
单调的
Of a function: never decreasing or never increasing as the independent variable increases.
This function is monotonic.
该函数是单调的。
Of or using the Greek system of diacritics which discards the breathings and employs a single accent to indicate stress. It replaced polytonic system in 1982.
Of a function: that either never decreases or never increases as its independent variable increases.
Uttered in a monotone; monotonous.
The temperature showed a monotonic increase throughout the day, never dropping once.
全天气温呈单调上升，从未下降。
The company's sales have been monotonic for three quarters, steadily rising.
该公司销售额连续三个季度单调递增，稳步上升。
A monotonic function always moves in the same direction, either up or down.
单调函数总是朝同一方向变化，要么上升要么下降。
This function is monotonic.
该函数是单调的。
We study monotonic sequences.
我们研究单调序列。
Not this
The lecture was monotonic.
Use this
The lecture was monotonous.
“monotonic” 是数学术语，表示函数或序列的单调性，而表示“枯燥乏味”应使用 “monotonous”。中文中两者常被混用，但英语中词义不同。
Not this
The monotonic of the function is constant.
Use this
The monotonicity of the function is constant.
“monotonic” 是形容词，不能直接作名词。表示“单调性”这一概念时，应使用名词形式 “monotonicity”。
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通常用于描述函数或序列，不用于描述人的性格或行为。
Dictionary facts from ECDICT, WIKTIONARY.