This is an ill-defined concept.
这是一个不确切的概念。
This is a broadly-defined concept of art.
这是广义的艺术概念。
If we think about it, wind chill is an ill-defined concept.
仔细想来,风寒是一个定义不清楚的概念。
And the temperature scale that turns out to be well-defined and ends up giving us the concept of an absolute zero is the ideal gas thermometer.
比如理想气体温标,它有精确的定义,并能引出绝对零度的概念,今天我们就先来谈谈它。
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