名词
中文翻译：Unknown
同义词：
['null value', 'null state', 'null status例句：1. The null representation of the variable is not meaningful.（变量的空表示没有意义。）2. The null representation of the data set is an important concept in machine learning.（数据集中空表示的概念在机器学习中非常重要。）3. The null representation of a function is often used to indicate that it does not produce any output.（函数的空表示通常用于指示它不产生任何输出。）']
例句：
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1. The null representation of the variable is not meaningful.
变量的空表示没有意义。
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2. The null representation of the data set is an important concept in machine learning.
数据集中空表示的概念在机器学习中非常重要。
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3. The null representation of a function is often used to indicate that it does not produce any output.
函数的空表示通常用于指示它不产生任何输出。