This is an ill-defined concept.
这是一个不确切的概念。
一个定义不明的概念；
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。
Looking at this list, you also may notice that "platform" is not an entirely well-defined concept.
看看这个长长的列表，你可能也注意到了“平台”并不完全是一个精确定义的概念。
Looking at this list, you also may notice that "platform" is not an entirely well-defined concept.
看看这个长长的列表，你可能也注意到了“平台”并不完全是一个精确定义的概念。
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