Have a language barrier. Lack of theme, so-and-so should be added before the live broadcast.

A complete sentence generally includes a subject (such as person, etc. , generally the center of the sentence), predicate (generally the action of the subject, especially the verb) and object (the development of the subject and predicate and the content to be expressed). There can also be attributes (before the subject), adverbials (before the predicate) and complements (after the object) outside the subject-predicate object. Incompleteness is the lack of one of the components.