How to understand the first paragraph of Article 2 of the Implementing Rules of the Patent Law

the technical features in the claim include two parts, namely, the preface part and the feature part. The preface part is a description of the existing technical features, which can be understood as the technical features of other inventions to be cited, and the feature part is a description of the technical features of the company's inventions, also known as the distinguishing technical features, which are the technical features that the cited inventions do not have, and are the focus of the whole invention.