It's important to know why it's there: the about attribute defines the subject in that subject-predicate-object triple concept I mentioned previously.
了解它为什么在那里很重要，其原因是about属性定义“主语-谓语-宾语”三元组中的主语。
Nominative is used when the noun is the subject or a predicate nominative.
当名词是主语或谓语主格使用主格。
Because every statement has a subject, predicate, and object, it is also referred to as a triple.
由于每个命题都有主语、谓词和宾语，也被称为三元组。
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