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1. The empty category of "unknown" is often used to describe situations where we don't know theanswer or have no information.
“未知”的空类别经常用来描述我们不知道答案或没有信息的情况。
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2. In the realm of data science, the empty category can represent a dataset with no relevant features or attributes.
在数据科学领域，空类别可以代表一个没有任何相关特征或属性的数据集。
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3. The researcher found that the empty category was not as rare as they had previously thought.
研究人员发现，空类别并不像他们之前认为的那样罕见。