形容词
中文翻译：Unknown
同义词：
['straightforward', 'unvarying']
例句：
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1. The temperature has been monotonic since the beginning of the year.
自年初以来，温度一直单调不变。
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2. The path was monotonic until it met the river.
这条路径一直单调直到它遇到河流。
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3. The data shows a monotonic increase in sales over the past year.
数据显示，销售额在过去一年内呈单调增长。