Well, I mean the definite article "the", you use when there's only a single specific item that you're talking about.

当你谈论一个特定的项目时，就用定冠词“the” 。

经常犯的失误 - SpeakingMax英语口语达人

According to the Ad Age article quoted above, the company is introducing the McWrap, a new item that comes in three flavors and a variety of possible calorie totals, ranging from 300 to 600.

FORBES: McDonald's Looks to Address its 'Millennial Problem'

Item 9: Newspapers must refrain from putting the opinion of the individual reporter in the news article.

UNESCO: Communication and Information