名词
中文翻译：Unknown
同义词：
['void', 'vacant', 'ineffective', 'nonexistent']
例句：
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1. The null value is used to indicate that a field is empty or has no data.
空值用于表示字段为空或没有数据。
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2. The company's financial report showed a null profit for the quarter.
公司的财务报告显示该季度利润为零。
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3. The null result indicates that the calculation was not successful.
无效结果表示计算未成功。